Because most people don't know what it is to believe in something so much, that you would give up your life, your family, your friends in pursuit of it. Nor do they want to try to understand.

In their position, I likely would fight, and I would kill, and I wouldn't care that I was seen as a villain. [Okay, he does care because it fucks up his descendent's good name, but he has to deal because it had to happen.]