I have no idea, one theory is people who became ugly adults but were slightly less ugly as children. Fohink about how the home alone kid looked normal as a kid but as an adult looks a bit off. For every one of him who is still a famous millionaire, there's thousands of people who just look unfortunate post puberty, and wish they never hit it.

The real answer is most likely drug companies and moral subverters and people sick in the head.