I agree partly with these comments, but I think that equalling Muslim extremism with Christian or Jewish extremism is a bit unrealistic. Islamist extremism has killed tens of thousand of people, most of them catually...Muslim. Islamist extremis, or call it Djihadism is an officail, recognised policy suypported not only by strong aremd groups, but also states. Can't be said for Christian extremists, who are small, limited in numbers, and not supportedby any stte. Even Jewish orthodoxes don't kill, thay limit their "extremism" at throwing fruits to other non religious Jews... Back to Japan: I repeat that Japan is probably the only country on earth where the risk of a sucicide attack by extremist muslims is nearly Zero.