Williams Syndrome is a genetic defect that deprives children of the ability to read social danger signals. They are at higher risk of being victimized.
The silver lining of this risk, though, is that they do not have social anxiety. Little kids with a normal genetic configuration strongly favor their own race at three years old. Williams syndrome kids do not. Researcher Andreas Meyer-Lindenberg concluded that racism requires social fear.
Equally interesting, I think, is that Williams syndrome kids are just as likely as other kids to see strong differences between males and females.