Even the most primitive tribe in the Amazon will kill or expel people like these.
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Yeah but some tribes in New Guinea institutionalized man-boy sex with the belief that boys need semen to turn into men.
And sexual use of children was not uncommon in the ancient world, including the Romans, the forefathers of Western civilization.
Thailand and Vietnam turn a frequent blind eye toward child prostitution. I saw a documentary where the little girls in a Vietnamese brothel seemed more traumatized being taken into state custody than they did waiting for customers.
The sexual desire for children is not freakishly rare - which is why parents must be careful - no letting your children stay over with unrelated men - and why law enforcement has to stomp on predators.
The entry into adulthood at puberty is very common in the history of most cultures, including ours. However, sex with infants and toddlers has never been common. Pederasty, is common over many cultures. What these creeps did isn’t. Also, the fantasizing about cannibalism, while hot unknown, is quite rare.