I work with pit bulls three times a week at my local city shelter and many are good dogs in a general sense. Many though need proper handling and are not getting it from the morons who surrender them to the shelter every day. This generation of pits is not my father's generation of pits as the breed has been subjected to extremes of artificial selection. Still, this does not always take well as genetics are complex, so we get the rejects of the litter and the breed out females that are not wanted anymore. So, it takes a experienced dog handler many times for pit ownership.
Banning breeds does not work as well as spaying and neutering to keep pit numbers at a representative level.
These are powerful dogs, usually, and can do some fearsome damage, so training is of paramount importance here.