I feel like, every religion should be allowed in every society, so long as the people practicing it choose to obey the law. The solution isn't to single out religions and drive it out. Even if a religion has more problems than other religions (I don't know statistically if that's true, just saying as a concept).
Our laws should deal with it. If they are doing something that is illegal, then arrest them. If they start enacting violence, then arrest those people too. Keep going at THOSE people that are doing illegal things and don't let up. If someone wants to practice their religious values in peace, then by all means. But at the point that specific people no longer want to live in a society, and want to attack others, then I think a country has the right to defend itself (with military action if need be).
I guess that's just my thoughts on this. That the only way you can deal with any kind of violence (even if from a religion), is to treat it like any other crime (focusing on the individuals doing it).
But I could also be 100% wrong. The issue is terrorism. How do you deal with that? So I can understand people not wanting to risk their lives. That they don't feel they should have to, just to appease people. People know if they go after others with the law, then they risk kicking the bees nest (and things like todays incident happening). And the law can't really stop that. And then people become afraid, and don't want to do anything.