Pitbull - and they are loyal and protective of their families. A pit, just like any other animal or even human, adapts to it's surroundings, and typically will act out from the way it or they have been raised/treated. Educate! It's not the breed, it's the breeder/owner - or you could even at times say, the abuser.
Don't shop. Adopt. There is just no excuse for shopping or breeding. Shelter animals need your help! Absolutely ... dogs - or any animal - are not playthings or accessories. They are living breathing entities with their own emotions. Shelter dogs are often smarter, healthier (no inbreeding problems if you choose a mutt) and they will love you unconditionally.