Why does America produce so many serial killers?
I would suggest that before we even attempt an answer to that question, that we first subdivide our serial killers, i.e., there are killers who kill for the mere thrill of killing, there are killers who kill for the sexual satisfaction involved, there are killers who view themselves as purging society of some bad element, there are killers [and this is where the "black widow" type come in] who kill for financial gain [you know, the woman who keeps on killing the rich hubby, boyfriend,...], etc....oh, sorry, since the one post mentions the baking of a human, there's also the mental illness type, i.e., the one who hears voices telling her/him to kill.
That being said, we simply cannot correctly claim that serial killing is entirely concerned with thrill seeking, as that doesn't cover the "black widow" as well as many of those who view themselves as purging society of some bad element.
To give the best illustration of the clean-up type that I can think of, Gary Ridgway, the Green River Killer, was this type, as he himself reported that he hated prostitutes. And I don't have a link to the dialogue from that made for t.v. movie, but in the same, Ridgway says: I thought I was doing you guys a favor, killing prostitutes. You guys can't control them, but I can. Or so I remember him telling the cops in the made for t.v. movie.
Sasha Spesivtsev is another clean-up type, as the motive was to cleanse Russia of the permissiveness of modern democracy. And so Sasha killed more than 20 street children and then cooked and ate them [with the help of his mother].
A third killer of this type was Joseph Franklin, who killed those who had interracially married, which he considered a sin. He is suspected of shooting Larry Flynt, of Hustler fame, and precisely because Hustler depicted interracial sexual relations.
Another target group for the clean-up type would be homosexuals. Herb Baumeister was probably such a serial killer. Dennis Nilsen of Great Britain was also most certainly this type as well. Either that, or we have a case of killing what we despise most in ourselves.
As concerns the someone told me to it, there's Albert Fish, he who couldn't accept the fact that the Mrs. left and later told authorities that God had told him to castrate young boys. However, he actually murdered children of both sexes and his road to ruin was in writing the parents of a girl he had killed to inform them how much he had enjoyed eating her.
Another of that type is Elifasi Msomi, of South Africa, who hacked his victims to death with an axe. He said that he was told do so by something or someone appearing on his shoulder [though the psychiatric experts at his trial said something about him deriving sexual satisfaction from his killing].
As concerns the "black widow," or financial gain type, we have Belle Gunness, who obtained her wealthy Chicago area males via classified ads.
Whereas the US was once far and away the leader in producing serial killers, South Africa and Russia are catching up, and even Costa Rica has a homegrown serial killer. And in some places, say Rio in Brazil, they find so many murdered in a day, that it's hard to tell whether a serial killer is on the loose. That was the problem with a Mr. Andrade [see link below].
Why do we have serial killers? Physical and sexual abuse in the home, absence of the father, sexual dysfunction, mental illness, etc. The "trifecta" of early warning signs is (1) cruelty to animals, (2) arson/setting fires, and (3) bed-wetting. And if we add later sexual dysfunction...
For a rather disturbing look at more than a few serial killers, please see:
http://www.greatdreams.com/serial-killer.htm