I think we need to find some middle ground here. We need to accept that some dog owners are a problem, but that we also shouldn't be demonising all dogs/owners.
I have several largish dogs. All have done basic obedience, are kept on leads unless in an enclosed dog-friendly space or a large enough space that I can see anyone coming from miles away, all have excellent recall (if in doubt they stay on leads), I always pick up poop, I never let them jump up or approach people or other animals without their agreement. I would support a scheme that would promote responsible ownership - license, basic training, insurance requirement, etc. I didn't see that my dogs pose any problems to anyone, despite their size, even when my DC were small, and find the amount of hate levelled at all dogs and their owners really sad.
But. We do need to address the problems of our of control dogs. There are some owners who do let their dogs off lead when they shouldn't, don't have recall, don't pick up poop, don't do any training, don't supervise when with children, etc. I live in the country, with fields behind us, with a right of way the other side, and see so many dogs allowed to run through the farmers crops, running up to on lead dogs, chasing horses and cyclists. It's a really big problem.
I'm not a massive fan of bull breeds myself, but have worked around animals long enough to know that just banning the XL breed won't fix the problem. Before XL was a thing it was pit bulls that were the problem, and before them it was rottweilers, dobermans, and even German Shepherds. If you ban XLs without dealing with the owners, they will just move on to another 'impressive' breed. I own one of the breeds previously considered an issue, and have met many more. And owned and trained correctly, they are not usually an issue. It is the owners who are the problem. That is the bit we need to fix.
But it would be nice to seek a balance - less black and white, less dogs are angels/demons, and more understanding the nuances of the problem and that it's not a simple fix.