I’m no expert but here’s my experience:
I’ve had/have three pit (mixes...as most are.) All have been sweet, happy dogs. I have acerage so we’ve always had some sort of motley pack to keep us company usually made up of castaways and roadside acquisitions. I’ve broken up enough dog fights or called dogs off a scent to know that pit breeds have more of a switch that’s hard to interrupt compared to other breeds we’ve had. Once that switch flips...it’s on 100%. Once you get the dog structured....you can interrupt that switch.
Most dogs require structure and purpose and most don’t receive that. Lump the whole dbag attitude and dog fighting issue and it creates a recipe for issue. As others have alotted a chihuahua that doesn’t get that is annoying but a larger breed can be deadly.
Having said all that, the first pit I had spoiled me. She was the easiest dog I’ve ever had. Loved everything. I was naive but kids would dress her up, play with her in the pool...never worries. The second would get triggered by other alpha dogs...learned a lot about canine body language...but he loved people... Third I found later in her life...she’s the beta in our house and respects dog hierarchies but getting her comfortable with new people can be difficult. She goes super submissive which Could be a sign of past abuse, so we limit her interaction to familiar people, gradually introduced.
So...long story short, dogs aren’t a one size fits all, every dog even within a breed has their own disposition. My guess in most of the stories referenced, the dog had previously exhibited some sort of indicative behavior....whether it be towards other dogs, cats, squirrels, the owners...whatever. It’s up to the owner to recognize and either correct, avoid, or give up the animal.
I don’t take my dogs to dog parks (they’re a horrible idea), I don’t take them to other people’s houses, they always hike on tether off property...and when I have people over after seeing everyone come in, they all get their own space somewhere else. This is regardless of breed. Nothing would probably happen but the downside isn’t worth it.
apologies for the diatribe... have tomorrow off....tipped a few and was hiking with the dogs tonight 😃