I'm not claiming you're sheltered because you're obviously not.
Have you ever met anyone from a rough part of a big American city? Inner cities chew people up and spit them out. There is little concept of family or loyalty. You've got fathers who aren't around and mothers who will literally sell the food from their kids' mouths for their next fix. In this environment I think it's entirely conceivable that there will be people with no one to really help them out.