demeo, tommy karate, kukilinski(iceman ) all picked on as kids. same with gravano. also, the majority of those unhinged cowboys are eventually clipped.
Borello talks about having some sort of learning disability and a chemical imbalance; plus he came from a broken home. im sure the Bonanno's wouldn't make Borello because he was unhinged and 'not all there'. Can you imagine someone telling a boss; ' hey, I got this ultra violent kid that will do anything we tell him to do with the added benefit of having a chemical imbalance, can we make him ?".
I know Alite mentions he was abused as a young teenage. That can definitely lead to violence.