Ugly Criminals

Not only are physically unattractive teenagers likely to be stay-at-homes on prom night, they're also more likely to grow up to be criminals, say two economists who tracked the life course of young people from high school through early adulthood.
"We find that unattractive individuals commit more crime in comparison to average-looking ones, and very attractive individuals commit less crime in comparison to those who are average-looking," claim Naci Mocan of the University of Colorado and Erdal Tekin of Georgia State University.

WaPo Link.

I actually find this believable. It doesn't excuse the crimes, but it would make sense that a person who isn't as good-looking--and isn't smiled at as often, fawned over as a child, treated as well as others--would be more inclined to a sullen, potentially violent, disposition. Hard to say.