“The whole idea that this is merely a political war, is wrong. We kill them, because Allah told us to, and not because they attack us. The only way out for them is to convert or to pay a head tax.”

That’s in complete accord with the Qur’an and Islamic law:

“Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the People of the Book, until they pay the Jizya with willing submission, and feel themselves subdued” (Qur’an 9:29).

A hadith depicts Muhammad saying: “Fight against those who disbelieve in Allah. Make a holy war…When you meet your enemies who are polytheists, invite them to three courses of action. If they respond to any one of these you also accept it and withhold yourself from doing them any harm. Invite them to (accept) Islam; if they respond to you, accept it from them and desist from fighting against them…. If they refuse to accept Islam, demand from them the Jizya. If they agree to pay, accept it from them and hold off your hands. If they refuse to pay the tax, seek Allah’s help and fight them. (Sahih Muslim 4294)

In response, of course, mainstream analysts will say, No, ISIS is twisting and hijacking Islam, and this is a political war. Some people are impervious to evidence.

“This is how ISIS pushed me to make a video claiming responsibility,” by Björn Stritzel, Bild, July 26, 2017: