What a scary situation!
That's awful. I think when you have such powerful breeds, especially if they are not seeming to be friendly, would let their dogs run loose, even if it was accidental. You've gotta be more precautious.
However, I'm kind of amazed at all the people who would willingly shoot these dogs. I mean... if the dog was KILLING my animal or extremely injuring my animal, yes, I'd have to do something to try and get the Pit off. Well, I don't even have a gun anyways, but I dunno... those are peoples pets too.
But anyways, that's a crappy situation and I can't believe the police officers didn't do anymore about it!