#Ideas may be bullet proof but they're not above corruption

Ideas like gods are held by a group of people, accept them, welcome them in, consider their ideas and absorb them, but corrupt them. Take their god and make it an aspect of your own. Take their religion and make it a subsect of your own. Their god dies and is replaced by your god, their festivals become variants of your festivals. 

**It's very hard for a minority group to maintain an identity in the face of total and overwhelming acceptance of everything they stand for.**

If you try to kill or oppress the idea you whittle believers down to a real hard core that hangs on and becomes tougher. If you welcome them with open arms they become soft and their true idea slowly fades into a memory of the old, the hippies, and the borderline bonkers.