A properly trained dog that is not inbred and retarded is not a problem.
The problem is inbred and retarded owners of dogs that demand the best most responsible owners possible.
For example, Rotties should never have been so popular, and breeders should have been FAR more responsible. A Rottie is a dog that MUST be properly trained and well cared for. It is not a dog for the average dog owner or the general public. Period.
The pitbull is no different. It simply is not a dog for just anyone.
There are plenty of dogs that just about anyone can own.
But "working" dogs like Rotties, Aikidas, German Shepherds, Dobermans, and others should not be sold to 99% of people who buy them.
It is the responsibility of the breeder to see that he produces an animal of the finest quality and places it properly. People are generally stupid, and it is the dog that eventually pays the price.
The AKC and other organizations that SHOULD be looking out for the best interest of the breeds are a joke. They do nothing to stop irresponsible breeders from inbreeding and generally breeding females to death. They also do nothing to prevent breeders from breeding dogs with poor health or other problems. You can just about breed a female to its father, brother, or son, and easily get papers. They allow the dogs to become excessively common, and the breeders, hungry for a dollar, will sell a dog to ANYONE.