I remember when I used to care about this crap, but lately I couldn't give two squirts over what the brain dead are doing. Sure beliefs are dangerous, beliefs kill thought, cuase a brain to ciese functioning. And a non-functioning brain is clinically dead.
But really, they did it to themselves. They built their own fortresses, out of fear and hatred. They see themselves as a faith under seige... so they're trying to lock themselves in, trying to convience others of faith to join them. But many religious individuals know better. These are just the ones who take it too far. You can shake your head and ask yourself, "what are they thinking?" But that doesn't solve anything. I find it's easier, and probably better to do you're best to ignore their backward thought process.
As long as they think they're under siege they'll continue to try to wage war from their fortresses of hatred and fear. But you can't win a war of faith from that position, no matter how zealous you may be.