If the municipality doesn't clean the area it would be a "real" danger against kids.
Also, if they are real aggressive, I assume a catastrophe has already happened or is in the making (especially with a child?). The authorities have not intervened yet?
"pitbull" isn't a dangerou breed, it is a correlation signal for a psychotic owner that torture dogs to make them violent.
I don't know if you're being flippant or not, but the desire to eat humans has long been bred out of the domestic animal gene pool (and, frankly, out of most of the wild animal gene pool as well). The dogs who are chasing you almost certainly just want to establish their dominance over you and defend their territories. It's also possible that they want to play.
But any dog that is chasing you, or any other human, needs to be put on a leash. You should have a chat with the dog's owner and point out to them, politely but firmly, that an off-leash dog chasing people s serious liability risk for them. And if the dog doesn't have an owner you should call you local animal control.
When I had a cat, I'd fairly frequently wake up with her staring at me, sitting on my chest in the "breath stealing" position. I always imagine her inner dialog being something like, "Morning! Are you dead yet? Can I eat your eyes? OK, not dead yet. Scratch my nose?"
http://news.nationalgeographic.com/2017/06/pets-dogs-cats-ea...