Why doesn't evolution get rid of ugly people?

Like sickle cell, in one context it's bad, and in another it's good. From a study on red deer, a speculation that those bad looks might actually be good in the opposite sex, so that trait persists:

Extrapolating to humans (and oversimplifying, sorry) you might imagine that a particular shape of the nose or turn of the chin would look drop-dead hunky on a male, but horsey on a woman ...