I was bitten by a Pit bull once. By the third time I hit it with a bat, the owner got there, and screamed at me.
I had to shoot a Pit Bull once. I wasn't going to get bitten again. The owner screamed at me.
A pit bull ate the interior of my BMW once. I screamed at the owner.
Different dogs, different owners. Same kind of situation, I was on a jogging path the second time, (It's a snake-y area, lots of rattlesnakes.), leaving a softball game the first. I like animals, but if you even think your dog might attack unprovoked, do not bring it out in public.
My opinion is a hard line one, one unprovoked attack, the dog gets put down.
And for the record, I like dogs.
But I've had three experiences with Pit Bulls, and they were all bad, so I think the breed sucks.