All religions have Hardline/radical believers.
Islam, Christianity, Judaism, Bahaiis, Zarathusti and even Hindus have radical believers.
Radicalism should be banned not the religions.
Viewing things from a realistic perspective, Islam is WAY ahead of ANY other groups in that respect and such behavior is soundly grounded in their founding documents, the behavior fo their prohet, and a long and unending history of such activity by Islam.