i would crate my bullies of any breed. they are wonderful dogs, and yes raising does have a lot to do with it. but genetics are stronger than the best dog trainers, unfortunately.
i would not crate a bully to keep it from fighting another, simply because if one wants the other badly enough the crate isn't going to stop him. i would crate to keep the dogs safe from eating something damaging or destroying something out of boredom.
those of you who preach good raising need to do some more research. owning one or two does not make you an expert. i know a lady who runs our local boxer rescue. she was house sitting for someone who had a boxer that she had known since it was a pup. on day 3 the dog just snapped and nearly took her life. not only is the dog CGC certified she's been through class after class after class of obedience and even some agility.
i also know a family who had a pair of APBT's who were littermates. same background, lots of obedience (positive reinforcement only) and spayed early on both parts, and one day while walking in the park like they did every day one sister calmly leaned over and removed the other's throat.
this is not bad breeding or even bad ownership. it is the breed. all bullies are pit bulls and pit bulls were bred for so long to be dog aggressive that breeding it out is going to be impossible. there is always that spark, that chance that something is going to set them off. this is why teenagers who have babies and pit bulls in the same household often end up in bad situations. it takes a certain type of lifestyle and person to have one of these dogs. i commend the ones who are responsible and would like to beat the crap out of the stupid ones who want a mean dog. bullies are very eager to please their humans, but sometimes they snap, and there's nothing we can do about it except pray we can handle the situation calmly if it happens to us.
so yes crate them, to keep their intestines safe. and love them, and treat them like family, but be prepared and never think your dog won't ever hurt anyone or anything because that attitude is what gets people hurt.
research and a long time love of the bully breeds