It's the owners, not the breed.
I call BS! Pointers point, retrievers retrieve, flushers flush, herders herd and Pits are breed to fight and kill, and they do! People give too much credit how smart their pets are, they operate solely on instinct. Love then all you want but keep they away from your kids and grand kids. You are living with a time bomb! You don't train a Pit to be aggressive and to fight. just condition them to be stronger than the poor bastard they kill. Gas them all along with the ass hats that fight them!
This is my experience from 10 years of investigating dog attacks.
I would only qualify it by saying any breed can be aggressive, even a 7lb Maltese.
I wonder how many of the labs/lab crosses, listed as the number one biters by the insurance industry, were actually pitbulls/pitbull crosses? It was/it is very common for pitbull owners to try to list their pitbull cross as a lab cross, to avoid the stigma/licencing requirements/insurance fees often required for pit bulls. In my experience, the tell is the slope of the forehead, the pitbull cross may look very much like a lab cross, except for the forehead slope and it may be more muscular.
Pit bulls are often popular among regular folk; for status (kind of like getting a Harley when you aren't really a biker and a Gold Wing is really your type), for looks (they can be very goid looking dogs), for behavior (some of the nicest dogs I ever came across were pitbulls), for protection (the owner doesn't like guns).
What many pitbull owners don't realize is that Pit bulls often are Dr Jeckel/Mr Hyde, one minute the best dog in the world, the next they've killed/mauled the neighbor's kid without provocation. When investigating dog attacks, I always tried to identify what caused the dog to attack. Pitbulls don't need a reason, they were bred to be aggressive, they revert to their type with no warning. They are very good at causing damage. One eary thing about Pit bulls is that they are often very calm after the attack. They can go from calm to unprovoked attack to calm like throwing a light switch. Other breeds do not do this.
Owning a pitbull is not worth the risk to the safety of people, often the owner's friends and family. I agreed with our policy that any unclaimed pitbull/pitbull crosses were destroyed.
I'd speculate that the pit bull attacks you saw were typically much more than a bite. That the attacks were pressed much further than they typically were with other breeds.
Pitbull bites do tend to be more severe than other breeds, but don't discount the damage that any large breed like rottweilers, german shepherds, labs, huskies, malamutes can do. Perhaps the worst mauling that occurred when I worked there, the young victim, a adolescent girl, looked like she had been mauled by a bear or a large cat. The photos showed chunks of flesh from her limbs were missing. Her mother claimed that it was huskies or malamutes that did it. It is very possible that their own dogs chained in the back yard did it. Mother denied it and we looked for the strays she claimed were responsible. Strangely, IIRC, their dogs resembled the "strays". No one twigged to that for a day or so, we were focused on locating the strays. We should have had their dogs stomachs pumped. Very sad.
About the first bite I investigated on my own after training, a rescue pitbull laid the adult males face open from the hairline near the top of his ear to the corner of his mouth. He told me the plastic surgeons used 212 stitches, both dissolving internal and external, to close his wound. I completed my investigation and even though the attack was unprovoked and the owner had his young children over on alternating weeks, I had to go to court to get an order to have the dog destroyed. Even though the owner had been guilted into adopting the abused pitbull from the SPCA by a SPCA employee/volunteer, (she said if the dog wasn't adopted, it would be killed the next day, it's time was up. Of course his kids convinced him to adopt it.), he felt he had to fight to save it. Dumbass, the dog had been tortured and burned by cigarettes by the previous owner. It was a landshark. He had to keep it on a logging chain. If you were close to it, it tried to grab you with evil intent. It always felt good holding those dogs while the vet injected the lethal dose of sedative.
Another time, a fellow officer asked for help investigating complaints of pitbulls chasing and biting people in an area near downtown. No one could/would identify the dogs or where they came from. There was a house where the owner had a revolving door of pitbulls coming and going. There had been prior aggressive incidents from pitbulls at that location. So many dogs coming and going, hard to tell which dogs had committed the priors and which were even licenced. Anyways, we're talking to the owner and a couple of the pitbulls were loose in the yard, showing no signs of aggression. I felt pressure on my calf and looked down to see one of the pitbulls had placed his mouth around my calf, just holding it. I asked the owner to remove his dog. I kid you not, the owner said, "Oh look, he's tasting you!" I told him I didn't care what he thought his dog was doing, he better remove it or I would and it wouldn't be so gentle.
That's the attitude of so many dog owners. Never their fault. Never their dog's fault. IMO experience, many, maybe the majority of dog owners were unqualified to own a dog. I would support that prospective dog owners had to take a course to prepare them. People are really stupid when it comes to pets. Pets are not people, no matter how much they mean to your life.
There were so many aspects of that job I loved. But after 10 years I had to get out and transfer to another department. I was so jaded, and sick and tired of dog owners. Two thirds of my life to that time, I had always had one or more dogs. Ten years of dog owners and bad dogs, I have never had another dog and no desire to. Perhaps I'm scarred from those experiences, yet other coworkers had all sorts of pets. I just can't handle it, much to the chagrin of my kids.
One final story. Someone was always on call, in case of an "emergency". One night at about 2AM I was called out to investigate allegations of two pitbulls chasing and biting people. I probably should have phoned the on-call supervisor to request back up. But by the time you get your truck and get to the scene, who knows if I find the pitbulls? I was hesitant to disturb another person's sleep on a maybe. I arrived there and started interviewing and getting statements from the victims. As it turned out the dogs soon turned up and were milling around the intersection in front of their house and the house I was interviewing victims at the time. I should have called for backup, even a cop car crew (in my experience, 80% of cops were useless handling dogs). Backup from my department was an hour away. I decided to try it myself. Sometimes things are much easier than first thought. I grabbed my pole and went to grab the pitbulls. They were experienced, while one pressed the attack, the other would circle and try to get me from behind. At one point, the male got quite close and the female was coming in from behind. I hit the male as hard as I could between the eyes. I expected to see some visible injury, but he didn't yelp nor was there a visible injury, he just backed off. I turned and drove the female back. About this time they ran around to the alley. I jumped into my truck and followed. I found a hole in the rear fence at the house they were from. I jumped out and they male stuck his head though the hole. I snared him and threw him into a cage in the truck. I returned to the hole and the female stuck her head out. I snared her and put her in a cage. Sweet. Now I noticed the rear door to the house was open. Strange. I had no jurisdiction to enter the house. I called the cops to conduct a welfare check of any occupants. A car crew soon arrived. I was asked to go in with them. We found no people, but there was a third pitbull in an upstairs bedroom. I impounded her for safe keeping. We found the remnants of a hydroponic marijuana grow op in the basement. There was hardly anything in the house. It was probably stupid to take on two pitbulls myself, but in this case, no harm, no fowl. Ten years, I was never bitten with any effect, although I did have tears in pants and punctures in the leather gloves I always wore, just no skin punctured. I always went a step more than I thought I needed to safely handle the dog and I always wrapped the dogs snout, just in case it panicked and changed its mind and decided to bite me. I had co-workers who were bitten multiple times and missed work due to the severity/infection. Always assume the dog will bite, they all can and will in the right circumstance.