Why do Fundamentalists of all religions refuse to allow others to follow their own path?

Belief is powerful. Just look at the stong believers here on R&S whether Christians, Muslims or atheists. They are all rather intolerant. And by the way, why don't you let Fundamenatlists follow their own path instead of calling them monkey brain? You are doing the same thing you accuse them of doing, not allowing them to follow their own path.