Serial killers are different from hired killers. Unlikely that serial killers get paid
But it seems like it would be rewarding work...no?
There's a bit from [italic]the President's Analyst[/italic], a spy spoof from the 60s. James Coburn plays a psychoanalyst in NYC who's been treating Godfrey Cambridge. After several sessions, Cambridge reveals that he's actually with a U.S. intelligence agency and has been vetting the analyst before his being offered a position as the president's analyst. There's something about Cambridge killing people for the agency. Then Coburn has a flash of insight.
Dr. Sidney Schaefer: Fascinating, Don... I suppose it's the conditioning of motion pictures, or television, or maybe it's just it's the times we live in, but... killing is serious business, yet this little card makes it somehow less shocking... acceptable in a way! You mean to say you can actually legally kill someone?
Don Masters, CEA Agent: Yeah, and it bothers me sometimes that I don't feel guilty about it. Don't you think that's psychotic behavior?
Dr. Sidney Schaefer: No I don't! It explains your utter lack of hostility. You can vent your aggressive feelings by actually killing people! It's a sensational solution to the hostility problem.
Don Masters, CEA Agent: Doctor, are you trying to tell me it's all right to kill people?
Dr. Sidney Schaefer: It's simply a moral question. Morality is a social invention, and in this case society has decided it's not only acceptable for certain people to kill other people... it's even commendable. Don! I've got to write a paper for the Institute on this!
Don Masters, CEA Agent: I don't think the CEA would like that.