In the wake of the massacre in Manchester, people rightly warn against blaming the entire Muslim community in Britain and the world. Certainly one of the aims of those who carry out such atrocities is to provoke the communal punishment of all Muslims, thereby alienating a portion of them who will then become open to recruitment by Isis and al-Qaeda clones.

This approach of not blaming Muslims in general but targeting “radicalisation” or simply “evil” may appear sensible and moderate, but in practice it makes the motivation of the killers in Manchester or the Bataclan theatre in Paris in 2015 appear vaguer and less identifiable than it really is. Such generalities have the unfortunate effect of preventing people pointing an accusing finger at the variant of Islam which certainly is responsible for preparing the soil for the beliefs and actions likely to have inspired the suicide bomber Salman Abedi.

The ultimate inspiration for such people is Wahhabism, the puritanical, fanatical and regressive type of Islam dominant in Saudi Arabia, whose ideology is close to that of al-Qaeda and Isis. This is an exclusive creed, intolerant of all who disagree with it such as secular liberals, members of other Muslim communities such as the Shia or women resisting their chattel-like status.

Manchester attacker's mosque: This cowardice has "no place in our religion"

What has been termed Salafi jihadism, the core beliefs of Isis and al-Qaeda, developed out of Wahhabism, and has carried out its prejudices to what it sees as a logical and violent conclusion. Shia and Yazidis were not just heretics in the eyes of this movement, which was a sort of Islamic Khmer Rouge, but sub-humans who should be massacred or enslaved. Any woman who transgressed against repressive social mores should be savagely punished. Faith should be demonstrated by a public death of the believer, slaughtering the unbelievers, be they the 86 Shia children being evacuated by bus from their homes in Syria on 15 April or the butchery of young fans at a pop concert in Manchester on Monday night.

The real causes of “radicalisation” have long been known, but the government, the BBC and others seldom if ever refer to it because they do not want to offend the Saudis or be accused of anti-Islamic bias. It is much easier to say, piously but quite inaccurately, that Isis and al-Qaeda and their murderous foot soldiers “have nothing to do with Islam”. This has been the track record of US and UK governments since 9/11. They will look in any direction except Saudi Arabia when seeking the causes of terrorism. President Trump has been justly denounced and derided in the US for last Sunday accusing Iran and, in effect, the Shia community of responsibility for the wave of terrorism that has engulfed the region when it ultimately emanates from one small but immensely influential Sunni sect. One of the great cultural changes in the world over the last 50 years is the way in which Wahhabism, once an isolated splinter group, has become an increasingly dominant influence over mainstream Sunni Islam, thanks to Saudi financial support.

Manchester explosion in pictures Show all 37 1 /37 Manchester explosion in pictures Manchester explosion in pictures People running down stairs as they attempt to exit the Manchester Arena after a blast, where U.S. singer Ariana Grande had been performing, in Manchester Twitter/@ZACH_BRUCE/ via REUTERS Manchester explosion in pictures Helpers attend to people inside the Manchester Arena after a suspected suicide bomber detonated an explosive device at the end of an Ariana Grande concert, killing 22 people PA wire Manchester explosion in pictures Armed officers guard outside a hotel near the Manchester Arena following reports of an explosion, in Manchester, Britain EPA Manchester explosion in pictures Police officers are seen outside the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester, northern England Reuters Manchester explosion in pictures MANCHESTER, ENGLAND - MAY 23: Police escort members of the public from the Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Christopher Furlong/Getty Images) Getty Images Manchester explosion in pictures MANCHESTER, ENGLAND - Emergency services arrive close to the Manchester Arena on May 23, 2017 in Manchester, England. There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening. Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Dave Thompson/Getty Images) Getty Images Manchester explosion in pictures MANCHESTER, ENGLAND - MAY 23: Police escort members of the public from the Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Christopher Furlong/Getty Images) Getty Images Manchester explosion in pictures Medics deploy at the scene of a reported explosion during a concert in Manchester, England on May 23, 2017. British police said early May 23 there were "a number of confirmed fatalities" after reports of at least one explosion during a pop concert by US singer Ariana Grande. Ambulances were seen rushing to the Manchester Arena venue and police added in a statement that people should avoid the area / AFP PHOTO / Paul ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images) AFP/Getty Images Manchester explosion in pictures Police and fans close to the Manchester Arena, after reports of an explosion Getty Images Manchester explosion in pictures There have been reports of explosions at Manchester Arena where Ariana Grande had performed Getty Images Manchester explosion in pictures Police deploy at scene of explosion in Manchester, England, at a concert in Manchester Arena AFP/Getty Images Manchester explosion in pictures Police stand by a cordoned off street close to the Manchester Arena Getty Images Manchester explosion in pictures Police deploy at scene of explosion in Manchester, England AFP/Getty Images Manchester explosion in pictures Police deploy at scene of a reported explosion during a concert in Manchester, England, on May 23, 2017. British police said early May 23 there were "a number of confirmed fatalities" after reports of at least one explosion during a pop concert by US singer Ariana Grande. Ambulances were seen rushing to the Manchester Arena venue and police added in a statement that people should avoid the area AFP/Getty Images Manchester explosion in pictures An ambulance drives away from the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester Reuters Manchester explosion in pictures Police escort members of the public from the Manchester Arena in Manchester, England. Getty Images Manchester explosion in pictures A woman sits in the street in a blanket near the Manchester Arena as police guard the area following reports of an explosion, in Manchester, Britain EPA Manchester explosion in pictures Two women wrapped in thermal blankets stand near the Manchester Arena, where US singer Ariana Grande had been performing, in Manchester Reuters Manchester explosion in pictures A Royal Logistic Corps (RLC) bomb disposal robot is unloaded outside the Manchester Arena following reports of an explosion, in Manchester. At least 19 people have been confirmed dead and others 50 were injured, authorities said. It is being treated as a terrorist incident until police know otherwise EPA Manchester explosion in pictures A Royal Logistic Corps (RLC) bomb disposal robot is unloaded outside the Manchester Arena following reports of an explosion, in Manchester EPA Manchester explosion in pictures Members of the public receive treatment from emergency service staff at Victoria Railway Station close to the Manchester Arena on May 23, 2017 in Manchester, England. There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening. Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area Getty Images Manchester explosion in pictures Armed police after a suspected terrorist attack at the Manchester Arena at the end of a concert by US star Ariana Grande left 19 dead PA wire Manchester explosion in pictures Emergency services arrive close to the Manchester Arena in Manchester Getty Images Manchester explosion in pictures An amoured police vehicle patrols near Manchester Arena in Manchester Getty Images Manchester explosion in pictures A man carries a young girl on his shoulders near Victoria station in Manchester AFP/Getty Images Manchester explosion in pictures Police officers stand at the Miller Street and Corporation Street Crossroads, in front of the Manchester Arena in Manchester, England Getty Images Manchester explosion in pictures Police block a road near to the Manchester Arena in central Manchester, England AP Manchester explosion in pictures Armed police patrol near Victoria station in Manchester, northwest England. Twenty two people have been killed and dozens injured after a suspected suicide bomber targeted fans leaving a concert of US singer Ariana Grande in Manchester Getty Images Manchester explosion in pictures Police forensic officers leave the Manchester Arena as they investigate the scene of an explosion in Manchester Getty Images Manchester explosion in pictures A forensic officer collects evidence on a walkway between Victoria station and Manchester Arena following a deadly terror attack in Manchester, Getty Images Manchester explosion in pictures A woman and a young girl wearing a t-shirt of US singer Ariana Grande talks to police near Manchester Arena following a deadly terror attack in Manchester, Getty Manchester explosion in pictures epaselect epa05982725 Susan Walton and daughter Katie, 10 (pictured), who attended the concert of Ariana Grande at the Manchester Arena, are seen in Manchester, Britain, 23 May 2017. According to a statement released by the Greater Manchester Police on 23 May 2017, police responded to reports of an explosion at Manchester Arena on 22 May 2017 evening. At least 19 people have been confirmed dead and around 50 others were injured, authorities said. The happening is currently treated as a terrorist incident until police know otherwise. According to reports quoting witnesses, a mass evacuation was prompted after explosions were heard at the end of US singer Ariana Grande's concert in the arena. EPA/NIGEL RODDIS EPA Manchester explosion in pictures Mayor of Greater Manchester Andy Burnham and Manchester City Council Leader Sir Richard Leese speak to the media outside Manchester Town Hall after a suicide bomber killed 22 people, including children, as an explosion tore through fans leaving a pop concert in Manchester Dave Higgens/PA Wire Manchester explosion in pictures The media gather behind a police cordon in Manchester Getty Images Manchester explosion in pictures Flowers left close to the Manchester Arena, the morning after a suicide bomber killed 22 people, including children, as an explosion tore through fans leaving a pop concert in Manchester Danny Lawson/PA Wire Manchester explosion in pictures Ariana Grande concert attendees Karen Moore and her daughter Molly Steed, aged 14, from Derby, leave the Park Inn where they were given refuge after last night's explosion at Manchester Arena Getty Manchester explosion in pictures Signs saying 'We love Manchester' are displayed in a window in Manchester, England Getty Images

A further sign of the Salafi-jihadi impact is the choice of targets: the attacks on the Bataclan theatre in Paris in 2015, a gay night club in Florida in 2016 and the Manchester Arena this week have one thing in common. They were all frequented by young people enjoying entertainment and a lifestyle which made them an Isis or al-Qaeda target. But these are also events where the mixing of men and women or the very presence of gay people is denounced by puritan Wahhabis and Salafi jihadis alike. They both live in a cultural environment in which the demonisation of such people and activities is the norm, though their response may differ.

The culpability of Western governments for terrorist attacks on their own citizens is glaring but is seldom even referred to. Leaders want to have a political and commercial alliance with Saudi Arabia and the Gulf oil states. They have never held them to account for supporting a repressive and sectarian ideology which is likely to have inspired Salman Abedi. Details of his motivation may be lacking, but the target of his attack and the method of his death is classic al-Qaeda and Isis in its mode of operating.