It can be difficult to sort it out because risk factors tend to cluster. But the environmental factors that lead to criminal behavior usually include abandonment by caregivers, lack of structure (think "bedtime", regular meals...), and abuse, especially by adults they should be able to trust. Limitations from a physical disability leads to criminal behavior much more often in comic books than it does in real life.
When I was in grad school, I knew a handsome young man who surfed, rode motorcycles, sky-dived, played bagpipes, and had been on the ski team in college. He was also smart, funny, and sweet. He maintained a long-distance relationship for several years that resulted in marriage, and that's not easy to do.
After I had known him several months, he told me a story from his childhood. That was the first time I found out that he had worn a brace on his legs when he was a small child because of a birth defect. He said his parents were surprised that he turned out to be so athletic.
So, I'm biased. I would not put a child through that pain if I didn't have to. But if that brace is part of what made my friend such an impressive individual, I have to love that brace.
