By "gangs", I guess you mean clubs consisting of boys that are raised without a positive male role-model. They attempt to compensate for a bad family life, and lack of discipline, by creating their own little "family" structure in the form of a gang. These individuals are frequently from one-parent homes, with a female as the head of the household. There are exceptions to this but, unfortunatly, this is usually the case. Children must be taught to respect life, and to obey the laws governing decent communities. If this is not done, then the outcome is usually bad.

And yes, I've know plenty of boys, and men, that went wrong.