But yeah absolutely no reason to feel uneasy about having them around your kids.
I don't have any pit bulls and never have. However, I know several families that do and one breeder. They have never had a problem with there pit bulls. I did a lot of investigation before I got our current dog and learned a couple of interesting things about this breed.
First and foremost, Pit Bulls love people and they expect love in return. Unfortunately, many people get pit bulls for home security, to guard the store, or warehouse without understanding their nature. They get them as young dogs, put them in a home or business alone for many hours or days with little human contact which to a Pit Bull or many other dogs is torture. Worse yet some believe they need to "condition" these dogs to make them mean so as be a good watch dog or guard dog only to find they are neither. They then end up in a dog pound then transferred from one rescue shelter to another because adult Pit Bulls are not valued as household pets, primary due to their reputation. Eventually a family adopts the animal but unfortunately, months or years of abuse can't be easily erased and they are often not suitable as a family pet.
Dogs being pack animals need contact and affection. The family becomes the pack and one person, usually the family member that cares most for the animal becomes the leader of the pack. Dogs need this. If you deny this and subject them to isolation and mistreatment, you are likely to have vicious animal.
If you want a pit bull, get a puppy where you know it's history and raise it with all the love and attention it craves and it will reward you with undying love and loyalty.