People like that don't need a reason apart from "because I can". They have a nightmare and try to make it happen.
Terry PratchettI was merely endeavoring to indicate that if we do not grab events by the collar they will have us by the throat. -Lord Vetinari
Terry PratchettChain-mail isn't much defence against an arrow. It certainly isn't when the arrow is being aimed between your eyes.
Terry PratchettBut is all this true?" said Brutha. Didactylos shrugged. "Could be. Could be. We are here and it is now. The way I see it is, after that, everything tends towards guesswork." "You mean you don't KNOW it's true?" said Brutha. "I THINK it might be," said Didactylos. "I could be wrong. Not being certain is what being a philosopher is all about.
Terry Pratchett