An alternative to the massive amount of regular training, self regulation, dog deaths and councils turning a blind eye would be breed specific legislation BSL.
However in Australia dangerous dog breeder groups and other political groups (particularly trainers) are still successfully banning most legislation that could keep dog parks and streets safe.
I am writing this as a pro dog walker, who myself had my dog mauled in my old home town less than a month ago. My wife was walking in the main street around lunch time, with a todler and my social dog on lead, and this idiots 'pitbull x bulldog' looking dog was off lead and just launched onto my dog. None of the 15 witnesses tried to help (probably scared) and the owner only got his dog off mine by kicking it a few times hard.
When a bite occurs in Mebourne or NSW it seems, all the authorities seem to do is casually look for the person, maybe fine them, and perhaps put the dog down. They are considering banning the person who owned the dog who attacked my dog 'from owing a dog for life', but they may not have the power to do so. There are ways around this.
If a dog is created to kill large animals (particularly pig hunting) and most people would have no chance of stopping it or defending themselves if the dog decides to attack, is that a dog you want in urban areas? They are NEVER exercised enough, and no one ever checks if they are, so how can they be self regulated??
Dangerous dog breeds were all created by man, they can also be banned by man in urban areas or whole countries. The will is weak, until a politician loses a family member.