the few times when I own a pit bull I never turn him loose in the back yard with the curs unless I am supervising them the whole time...but I will let the curs run together in the back yard with minimal supervision...because I know I can usually break the curs up pretty quick...
I agree. But its like putting I big ol muscled up, nice fella in a room full of cocky, mouthy, chest poked out fellas. The big guy probably wont start it but if provoked, he will probably do the most damage.

But as dog owners, it is our responsibility to prevent the occurance. Im just pointing out that sometimes bulldogs get a bad rap when they aren't the ones who usually instigate.
However, there are excetions to this. And this is when culling can help the breed. IMO