Yetis are more pure

The Happy Mutant Handbook had an article called SZUKALSKI: GOD KING OF THE KOOK NATION and it mentioned one man's yeti theory:

"His most important discovery (realized from studying such diverse artifacts as Greek vases and Sumerian bas-reliefs) was that throughout history, Yetis or Abominable Snowmen -- "Bigfoots" in the New World -- have been tainting the pure and noble human stock, producing a half-breed race which today includes all evildoers, politicians, throwback hillbillies, and those with short legs and/or a pug nose."

........

"One may spot these treacherous Yetisyny by their longish arms, extended upper lips, undercut noses, and short legs. (All of which, ironically, happen to apply to Szukalski's own physique!) All unattractive people, insecure people, and bullies are Yetisyny who, because they cannot be loved by a human (being sort of ugly), overcompensate by becoming crazed evil geniuses, ferocious gangsters, rude clerks, or crafty fomenters of bloody revolutions."

Apparently the Church of the Subgenius agrees with this theory, but argues that he got it backwards. It was not the yeti that were evil and destructive, but rather the humans they breeded with.