I do not think so, the killing and maiming of innocent concert goers is not acceptable, it is the action of nut bars who need to be cleaned up. The outrage in the British people will make the British vigilant to route out these bad apples. Him and his family are British because his father  requested asylum from the Libyan government, it is to bad they let his father in. Once they find out how this situation developed the British people will route out this sort and get rid of them. This is a good thing. Arabs of convenience are not welcome hear and soon in England.  We had the same problem when thousands of Lebanon citizens remembered they were Canadian because they wanted to escape the Sunni Shia civil war and we paid to get them out instead of leaving them there. They were Canadians of convenience.