I agree with that, they are powerful dogs and can do a lot of damage in a short time. So what's your solution?
Everyone with a staff, pit bull, mastiff, rotweiller, alsation, greyhound, Labrador etc etc do we put them all down? I was bitten by a basset hound only trying to play bit f***ing annoying and that was powerful enough so would your sister stop a dog like that from attacking your nieces? Any dog will kill a child, breed is irrelevant it has nothing at all to do with it. Train your dog its fine!