I think that the UK should make a stand and neuter/muzzle any dogs with genes of fighting/baiting dogs. Staffies were bred to kill and attack bulls in a frenzied way. Most other domestic dogs were originally bred to protect livestock/the home or for hunting game under human supervision. We should just have dogs from the last two categories and permanently erase the others.
It's not like we'd be destroying those breeds as they would still be extant in the rest of the world. People who want fighting dogs could either move abroad or open a zoo and keep pitbulls etc in a secure environment.