Where can I sign up to be a professional hater and get paid for it?
Such occupations become akin to being a thug in a gang, if you join you don't really get to choose your gigs and will have to bite your tongue if mistreated by superiors because your work is so shady that they eliminate any "stool pigeons".
Don't go into it, no matter how flower the cause is, if the job objective is like that of a debt collector or otherwise just threatening and harassing, you don't want to find out how bad it gets.
Evil is still very real, it just wears many masks on many sides.