I suspect so. I'm of it's world and not exactly known for heroic acts so, not hugely shocked it went for me.
It's darkness. I don't know what else to call it, it's this dark force that takes people over, corrupts their heart till it's black and dead, kills the person, leaves a shell that's just true evil.
The Dark One is the latest host. They're the ones that hold that power, or well, it holds them.