@DoubleShotEspresso Because your analogy doesn’t work. Kitchen knives aren’t banned; hunting knives, machetes are banned. Guns are either banned outright or for some types only obtainable under a licence. Or in other words, not all knives and guns are treated equally under the law.
Where knives and guns are banned it’s because of their fundamental nature (not how they’re used). You can’t own a handgun or machete if you promise to undergo training in how to use it. They’re banned outright.
So why hasn’t the knife ban worked? Partly because there are plenty of knives whose nature isn’t inherently dangerous and so they aren’t caught by it eg. pen knives, kitchen knives. They’re still dangerous knives but we can’t ban all knives, as that’s not proportionate. The same is true with dogs like labradors and sausage dogs - capable of causing damage and in fact statistically more likely to do, but they don’t have a fundamentally dangerous nature. It’s about how they’re used.
To truly enforce your suggestion, you’d have to ban all dogs (and maybe all knives, actually - they’re worse than dogs!) on the basis that they’re all on the same level as handguns. And given that dogs are alive and far more widely owned than handguns, this is quite complex. This is why the debate “rumbles on”, not because everyone else is stupid and only you see the light.