Common sense. All Western states should do this. Those Muslims from the West who go to fight with the Islamic State have declared war on their home countries. They are not citizens of them; they are citizens of the umma. All Western states should do this, but few if any will follow Australia’s lead.

“Citizenships of up to 110 Aussies fighting with IS to be canceled: gov’t,” Xinhua, April 8, 2016 (thanks to Lookmann):