There are tons of videos of people who rescue them and feel sorry for them. Almost do, especially a pure white one dumped to die in a FL preserve. Should be good hunting grounds there though. I hate to see them suffer. Better that they get put down. Just too risky. But I couldn't do anything inhumane to them unless they were attacking me.
Euthanize them yourself.
I have no problem putting a 22 into the skull of any nasty animal. If you live in a rural area there is no problem. If you live in an area where you are not allowed to discharge a firearm then get one of those cheap fixed-blade survival knives and put it in their skull.
Pit Bulls are bred to be fighter/killers. It is in their DNA. I knew a dog-loving family raise to mutts and then a Pit Bull from birth. When that stinking Pit Bull was about 13 months old it tried to attack a stranger who was walking on a sidewalk. It was leashed but with their younger daughter and if she hadn't been able to hold on I would have stepped in and popped it with my 45ACP carry piece.
Pit Bulls are trash.