What else is a person going to do? Wallowing in self pity simply isn't a productive way to live one's life.
That's the beauty of the human spirit. We can overcome such forms of adversity, and even adapt to them.
However, that being said, I think it's kind of hard to argue that "adversity" of this sort is intrinsically valuable or useful to either individuals or society as a whole. It simply makes things more complicated than they have to be and causes unnecessary problems.
If everyone could be born "normal," I'd say that it'd be better if they were.