in the interest of stopping a tread jack...
Shouldn't be a problem. The discussion is germane to the OP's question, because he was specific about a particular threat. This is head and shoulders above Zombie scenarios; pit bulls are shot by police and citizens everyday. Zombies - not so much
A blog I used to know of tracked shootings of dogs, but gave it up after a year because of the work load. An LE contributor noted that today's LE officers are about as likely to shoot a pit bull as a felon, according to a near match of reported pit shootings compared to stats of officer involved shootings of people. That's a remarkable accomplishment for a type of dog.
I don't think anybody is saying pit bulls can't be kept safely. Even lions, tigers and bears can be kept safely, but do you want your Joe Blow neighbor to have a grizzly without special precautions? Would you object to him having a lion while saying, "It's just a cat - it's all in how you raise and train them?" The fact is, all types of dogs are neglected, untrained, etc., without a similar rate of failure.
Pits gain more news coverage because of this hatred of the breed.
Not true. Pits get news coverage because of news worthy mayhem - some of which isn't even reported or is scarcely reported. The most recent death by pit bull here in Missouri almost didn't make the news, and then it was only reported by one small town paper - 6 days after the fact, and only because someone familiar with the death wondered why it hadn’t been covered. (The owner believes his father was killed by a mountain lion... Because that’s what mountain lions do… they jump into a yard with pit bulls and kill people.
You couldn’t make this stuff up! The owner goes on, “The pits couldn’t have done it; they slept with my father.") I’ve been on pit attacks as a medic that weren’t reported by the media. The attack on me by my neighbor’s pit wasn’t in the media. The fact that I escaped serious injury doesn't mean it didn't happen - it means I'm not a kid or a little old lady that would have made the news. (Very responsible owner too, but the dog got out one time – first and only time out by itself. Possible cause: Agitated by my dogs on the other side of my gate, and decided I was the next best thing? Who knows? Short answer: Pit bull.) If I go to the pound right now, there will be at least one or two pits impounded for attacks. You could back test 2 weeks of news without finding a word about it. Sorry to be contrarian, but pit bull attacks are under-reported. There is no big bad media conspiracy; the media is only reporting the part of the iceberg it can see.
The bottom line is, the OP is asking a question frequently asked, not just in gun forums, but firearms training and conceal carry classes. “How big of a gun for a pit bull? What kind of ammo for a pit bull? Where do I aim on a pit bull?” It doesn’t matter that you’re satisfied your pit bull is safe, well trained, or even a breed ambassador. Show me a pit bull owner that doesn’t talk that talk?
I’m very happy to have owned some intelligent, loyal breeds, without ever needing to defend them. Nobody has ever had to put up a web site to defend my breeds, (or condemn them.) No community, providence or country has ever outlawed my breeds. I’ve never spent time talking out of both sides of my mouth about my breeds – telling the public they’re, “just like other dogs,” while admitting in a breed forum that I snicker when I see a mother rushing her children across the street. When people are talking about my breeds in gun forums, they're talking about gun dogs, not asking what gun to use against them. I don't have to make excuses or learn talking points to recite here, there and in gun forums. Thank God for that!