Why the fucking hostility dude? Broad stoke- dog got killed. Doesn't really matter if one was tied up, does it? And what if the pit's leash was 8 feet long and covered the sidewalk? You don't know what's going on in the mind of an animal, but I seriously doubt it was scared and felt 'cornered' by a fucking yorkie walking by.
Telling you to shut it is hostility? No, it's sensible when you obviously don't know what the hell you're talking about. You haven't got a fucking clue about dogs, obviously - yes, it does matter if one was tied up. No, dogs do not know or care about considerations such as size. Have you never heard Twain's famous, “It's not the size of the dog in the fight, it's the size of the fight in the dog.” And again, you don't know that the Yorkie was just walking by.
A) you don't know the scenario
B) you know dick about dogs
So, I repeat - shut it. Stop placing blame when you don't have a leg to stand on.
...not that there's anything wrong with that.