OP I get it, these dogs are more dangerous than other dogs so there is no comparison to a chihuahua etc. It’s like comparing a lion and a mouse. Both can be aggressive but the potential for damage they could cause is miles apart.
I don’t let my kids anywhere near these dogs because the owners often, not always, think that their dog wouldn’t hurt a fly, underestimate and don’t take enough responsibility for them.
For example, the flats we used to live in - one resident used to let their cane corso roam around the front and back garden freely. I wouldn’t let my DS out for this reason. The dog was nice enough but if my son annoyed it for example, the consequences could have been awful.
Also had a (mixed) pit bull get in through patio door and start sniffing at the baby. The owners just laughed from the garden as if it was sweet. I was not impressed to say the least.
When I was a teenager I knew someone that had a pit bull who used to sleep in my coat when a puppy, we had a lovely bond and he was a really sweet dog. One day a couple of years later, I had to pull it away from another dog it was barking at, the dog turned on me and tried to get to my neck and forearm. It literally wanted to kill me. The strength of it was unreal and it was only because there were other adults to restrain it that no one was properly hurt. The owner was shook by this and decided to get rid not long after.
DP was nipped by an XL bully a few months back, totally unprovoked. Just walking past and bit the back of his thigh.
Guess how many times I’ve had these kinds of experiences with labs, spaniels, pugs etc? Zero.
I agree that your son should be able to play out safely on a quiet estate away from cars and it pisses me off that owners let these dangerous breeds wander around.