Its much the same as a vicious pit bull that is aggressive and attacks everything in sight. They have the fight to kill in them and it's just not reality for them to be rehomed. It's much to risky and dangerous for the next owners and trainers. You can teach some manners, but you can't change who they are. Each new day theyre given the benefit of a doubt is a new chance to attack or kill. I have raised my pitbull from a pup. She will be 11 on the 11th. Although her breed has a bad rep, her personality makes her different. She doesn't have an aggressive bone in her body. Ive raised 4 children with her. Blah, blah, blah, point being.. If she was ever to attack or bite anyone, especially my children, there would be no second chances for her. It's far to risky. If she did it once, she could do it again. Back to the point, its not always best to rehome. Sadly, there isnt a place for everyone.