Mass murder in the name of a principle is as human as apple pie, borsht and steamed rice. Treating the perpetrators as space aliens simply disguises the nature of the problem. The potential mass killers live among us, as they always have. They often have perfectly good manners, and some even have high ideals. And the only way the rest of us have to keep them from power is to remember always that the end does not justify the means.
I think I wrote too harshly of Dyer earlier today. I'm reading through his 2004 material and finding quite a few gems. Evil is an everyday, human affair. Considering how awful we are now, it is chilling to think of how nasty we were when we ate Neandertal.