Drug folks raise them and then when they get mean or do something to the drug family often they take them out and just let them go.
Actually, in the ghetto culture, the first thing they do with a puppy Pitbull (especially if they're involved in drug dealing, but even absent that factor) is to set about "making them mean." They have a whole procedure for this, involving staking them down by a rope and having buddies from other neighborhoods come by and strike the dog with a broom from time to time. When the dog finally gets enough of it and drives aggressively towards them in an effort to bite, the agitator runs away in pretended terror and leaves. This does two things: firstly it teaches the dog that most strangers will try to hurt them, given the chance, and secondly, that aggression towards them is the solution.
Did a negro in a pickup truck stop and tell you that bit of wisdom or are you a natural born expert on "ghetto culture"?
