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I know multiple Pits, they're pretty mellow. All are people friendly, most are dog friendly. If dangerous breeds were classified based on a risk assessment, then a bundle of larger protective breeds (and some smaller ones!) should be in there, GSDs and Malinois in particular. I volunteered for a couple of years at a GSD rescue and a solid proportion of the dogs in there were given up because of issues with people (let alone other dogs.) I don't pet any of those protective breeds without asking the owner (including ACDs!)
If you've seen a Jack Russell catch a rat, or a Greyhound a cat, the idea that Pits are somehow more murderously unstable seems a bit nuts.
Jung-
I mean, there's anecdotes and there's data. For what it's worth almost every single staffy or bull terrier breed I come across is either held tightly by the owner so they can't go for the small fluffy animal, off lead with barely an owner in sight and looking like a menace, or she meets them and I get told its fine cos she's a girl but they attack males.
Despite all the cases of them attacking people including their owners a lot can be very affectionate with people which makes it harder to believe when they rip apart any cats they can get their teeth on. But then that's fighting dogs, they weren't bred for people aggression, just animal aggression.
Sumo
The DDA check is just measuring the dog and seeing if it fits the mould they have of what a pitbull / dogo argentina etc look like, it's not exactly a holistic investigation in to the genetic make up of the animal.
In this particular case you've got a dog which is from a breed already very closely related to the pitbull from unknown parentage, if given the chance wouldn't you want to know if you've potentially got more than you bargained for?
In a word yes. Pitbulls themselves are known for "snapping" when they reach maturity, there's many, many news articles about the family pet that they'd raised since a puppy one day just deciding to attack it's owner or other family pets after 3+ years. The problem with pitbulls and fighting dogs is they don't growl or show signs of aggression to warn you off, they just attack and don't stop until the thing is dead. If you have a dog that comes from a line of fighting dogs you need to be hyper aware and not put them in a situation where they can do harm.
4 years old, killed owner
4 years old
Here's a little bonus article, we all know dogs that look like those in the picture. Call me when someone posts a similar article and the photo is of someone leading away a Cockerpoo.
https://metro.co.uk/2021/06/10/norwood-park-blind-family-dog-dies-after-being-mauled-by-pit-bulls-14748264/