[StormEye]

"Self loathing doesn’t do this justice. We need a new term for these “people”.

I can't think of a word that applies to a person who does that to himself. Perhaps "insane" would do?

[Bigg Red]

I can’t think of a word that applies to a person who does that to himself. Perhaps “insane” would do?

***
How about “demonic possession”?