Now I realize they're an ancient religion that is believed to be extinct.
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I agree. Pride, greed, wrath, envy, and lust can only explain a part of it.
Five or so years ago, I would have rejected the idea that there was a group of people responsible for endless wars to enrich themselves, create legions of displaced refugees, and kill for killing's sake.
Now, I believe they exist and that they are adherents to an ancient and abhorrent religion only gleaned from history books and the Old Testament.