None of the breeds should be banned, anyone thinking that is absolutely utterly ignorant.
Not because I think some of these breeds are fluffy love-bugs who wouldn't hurt a fly, but because banning a breed INSTANTLY makes it much more desirable to the very people who should not have any dog at all - and of course, it pushes others to invent similar breeds they can easily cause to be dangerous to fuel their own egos.
the American Bully /XL bully/Toadline Bully etc etc, all came out of the pitbull ban, as dogs that were/are/probably (given the state of our law..) legal to own, that lend their owner some sort of kudos for having a muscle bound fat-headed dog they can parade around the streets and act macho over.
There are others you likely won't see, the Gull-Terr, the Bully Kutta, and then theres the one folk are less likely to recognise as a problem - the Akitas and Belgian Shepherds that are IMO far more dangerous, being owned by people who want to play at protection 'sports'...
The problem is as it has always been - some people should NOT have a dog, they should not be owning dogs, training dogs, selling dogs.
There have been 0 fatal attacks in the UK, that I am aware of - by dogs owned by people who were educated on dog behaviour, by people who were competent with positive reinforcement training, by people who bought dogs from reputable, ethical breeders or from similarly reputable, ethical rescues that assess dogs properly and put some training into them.