Radicalization is a very real problem. It's hard to imagine a good reason Facebook should allow ISIS propaganda videos with beheadings and torture killings on their network.

If someone was walking around a grocery store with posters of corpses and passing out literature that advocates violence, they sure as hell would and should get kicked out.

I'd argue that we should let them use Facebook, the more one uses it the less they are out there killing people.

Killing people does not take much time, terrorists are not out there killing people 24/7. It's more like once in a lifetime until they get shot by police.