Most serial killers are homosexual.
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Pretty much all of them are sexual deviants such as necrophiliacs or sadists. I don’t know if most are homos, but I wouldn’t doubt that the proportion among serial killers is much higher than homos in the general population.
As kids they wet the bed, they set fires they torture animals.
They usually come from at higher than middle class and are intelligent.
Almost all of them are white males.