If you decide to possess any animal, you should be willing to accept the punishment for anything that animal does as if you had committed the act yourself.
To me, that is the end of the debate. I have two Cocker Spaniels, and I am aware that they are dogs and could possibly bite a child. If this did happen, that means that I was negligent and therefor am willing to accept the responsibility. I am not worried that my animals will ever kill anyone, however. I would never own an animal that is capable of killing someone for this very reason.
If you own a Pit Bull, or any other breed of animal, that kills another human being, you have committed murder and should be treated as such. End of story.
Ditto! Well said.