I have met, personally, at least three people who are inhabited by indwelling spirits. Reaching a high level of spiritual evolution does not send a person into a moral tailspin. As for Crowley, he had issues. Seriously, read Lon Milo's biography of him, but the thing you have to remember about Crowley is his only goal in life had ALWAYS been to be famous. He wanted to be an actor or writer or poet. He achieved fame through infamy and that, and his ego, is what truly consumed him in the end.