And I don't disagree fundamentally with what you've said, but again that all brings us back round to 'The issue is that extremely hardcore dogs have become the go to family dog of the masses in some areas'.
All of the above issues you describe are happening across the country with Labradors, Dobermanns, GSDs, Springers etc. etc. ad infinitum - but these breeds are not killing adults regularly and children too, are they? They are not being beaten with spades to try and stop them when they attack, but continuing until Police shoot them?
You can say it as long as you like, but in its current form in this country, this breed undoubtedly is an issue and the law couldn't come soon enough for most clear thinking people. It won't be perfect, no law is - but it's a start and let's hope the Police use it to act quickly on any initial issues. People bang on about the law not having eradicated Pit Bulls, and I'm sure that's true, but they didn't exist in the numbers XL Bullies exist in general family homes and it's only increasing.
The law won't stop attacks inside the home, but if making them hard and more expensive to own stops every other family in crap small accommodation having them, then that in itself reduces the risk.