I think there's a legitimate argument for removing one category of folks from the gene pool, because they spend the little time they are given on Earth making other folks' lives miserable. Back when I was playing MMOs, some twisted folks -- known as "griefers," would lie in wait to mug lower level characters and find creative ways to destroy the fun in a game, often eventually killing it. Then came trolls, folks who drop into forums to attack other members, often driving people away from the forums and killing them.