Here an example from Australia:
It is not necessarily a matter of what a majority in a group is capable of doing but if there is a considerable minority that is ready to (and often also will) commit monstrous acts.
Islam, the ideology on its own, is not the problem, it is the people that brings the horrifying practices of Islam into the western world that is.
Consequently that group of people has to be kept out of our countries since otherwise the western world will soon cease to exist, its cultures and its peoples.
The hell ride to this future soon likely to come, leaves an ever growing trail of suffering and blood.