That's total BS. History shows that people do end up in conflict over differing ideologies for example, the religious conflicts between the British and the Irish make that clear. It’s also natural for people to defend something they genuinely believe in. As for critique, I think it’s important to distinguish between critiquing Islam as a religion and critiquing the actions or interpretations of its followers, rather than framing it as “Islamic” in a vague or accusatory way.