Damn Christians. They appear to be fallible. I suspect the rumours about them being 'humans' is sadly true. Luckily, there is still one infallible group left...
*ponders*
Hang on...no there's not.
On a more serious note, the things that cause extreme behaviour can be readily linked to fundamentalism, be it of the religious nature or not.
Oh, and if anyone wants any info on the Irish troubles, let me know. It's a hobby of mine, and I have a good personal library on it, taken from various perspectives.