Did you mean attacks? Some bulldog variations are, like Staffordshire bull terriers, American bulldogs and pitbull dogs - last breed is supposedly illegal here but there are definitely crosses here and American bulldogs are here and called American staffies
Their jaws are incredibly strong and that is the danger. The breed that Anna has was/is was owned by Princess Anne and one of hers caused a lot of damage to one of the Queen’s dogs as I posted previously as well as biting two children in Windsor. In my local park an American bulldog was responsible for mauling two smaller dogs.
Why would anyone want to have a dog that they would worry about biting someone or another dog on a walk let alone the damage the jaws could do, or have a dog to have inbuilt health problems that would cause the dog pain?
I’ve met some very friendly pitbull dogs in the States, but I still wouldn’t want one. I visited quite a few rescue centres in the States when looking with a relative who wanted a dog. Approximately 90% of the dogs in there were pitbulls.
Some dogs also have high prey drives and are unsafe around smaller dogs or cats. sighthounds fall into this category and if rehoming one their prey drive needs to be tested or be prepared to have the dog wear a muzzle when out.