I have a Staffy - an ancient, rickety one but a Staffy nonetheless!
She is loving and adorable, just loves doting on humans and I would trust her almost 100% if she wasn’t, you know, a dog. She has never in her life so much as looked at a human in a way I didn’t like but I would NEVER allow her around a child or someone she didn’t know unsupervised. She’s always on a lead on walks - very often kids will come up and ask to pet her and I always say no as I can never risk that being the day she decides to bite. She’s my dog and my responsibility is to keep her and everyone else safe.
Some breeds are more disposed to have a prey/attack drive, yes. However in my lengthy experience as a dog owner and observing other dogs with their owners out in public, the vast majority of problems are caused by owners who just do NOT take their responsibility seriously. The sheer number of dogs who bound, leash free, up to other dogs and children is insane.
It just takes an irresponsible owner and a poorly trained dog to end in tragedies such as this.