That's my point though @Kevinyoutwat
As a society we've normalised almost every household owning a dog WITHOUT those households doing their breed research and making absolutely sure they are choosing the right dog for their circumstances.
We've made unsocial dog behaviour socially acceptable. It is NOT ok for dogs to be running amok in public spaces with zero to little recall, harassing families and other dogs, jumping at people for attention "because he's friendly dontchya know!"
All of these things along with little to no regulation or enforcement has made it easier for the people you are referring to to own the more dangerous dogs in plain sight.
You are right, they won't give a shit about complying but if the MAJORITY of people are complying and there is appropriate enforcement in place, it highlights those who don't comply.
Yes, there will be some who "go underground" and do it anyway (the same as there will always be those who drive cars without licenses or insurance) but there will also be some who become disincentivised.
It's about taking multiple measures to ensure life is a lot more pleasant and safer overall, not trying to eradicate something completely because let's face it, that's unrealistic.