Have you considered how many millions of dogs there are in this country and how rare this sort of thing really is by comparison? Yes we've all seen the recent stories in the news, but that still doesn't make it common or frequent.
I'm afraid I don't know the details of the latest case, but from the other cases I have heard about over the past year, several involved dogs with a known history of aggression and some with a completely unknown background being left unsupervised with very young children and kept by people with very little knowledge of dog behaviour and communication. Of course every case has been absolutely tragic and all are bound to elicit a powerful response from the public. But draconian, unenforceable legislation is not the answer.
You can no more legislate against single, individual attacks by dogs than you can against humans that suddenly - and apparently for no reason - turn and attack, maim or kill and believe me, there are far more cases of that in the news every single day than there are incidents involving dogs. We have had cases of lone humans killing multiple people in unprovoked attacks in both Europe and America in the last few days (and that's without getting started on the innumerable horrors taking place on a daily basis all over the world in the name of religion, power and money and the alcohol and drug induced incidents that take place in cities across the country/world every weekend). I don't hear you calling for all human beings to be placed under Marshall Law and forced to remain in their own homes in case they might, possibly, one day launch an unprovoked attack on others.
More children are killed by adults, often the very people that should be there to love and protect them, every single year than dogs ever cause serious injury to, let alone kill. You need to take a step back and try to gain some perspective.
It was the press' aggressive and often inaccurate reporting of a handful of dog related incidents in the early 90s that led to the vilification of certain breeds and ultimately breed specific legislation being introduced in the UK. All that led to was the destruction of countless perfectly behaved family pets that were unfortunate enough to have been born the wrong shape/size, whilst simultaneously driving the type of people that deliberately raise large, aggressive status symbol dogs underground and making the dogs themselves even more of a status symbol among certain groups of people (generally being those that shouldn't own a dog at all, let alone a large, powerful one). It also led to new crosses being bred, between dogs that simply should never be crossed, let alone kept in a domestic environment, especially when they are being raised by people that don't bother to educate themselves about how to look after dogs properly and train them without using fear or brutality.
It's people that are the problem, not dogs. The vast majority of dogs in the uk are owned by responsible, loving owners. What is needed is greater education regarding understanding dogs, their behaviour and communication skills and how to socialise and train them positively to produce well rounded, sociable pets. Dogs have been part of our lives for thousands of years, but we have reached a point in our so-called evolution where we now expect them to live in a wholly artificial environment and fit in with our increasingly frantic and stressful lives. Education about the treatment of animals, including/especially dogs and other pets should be part of the national curriculum, that way every single child would at least learn the basics of how to behave appropriately around dogs and also what it actually means to take on the very real responsibility of sharing your life with one.
Knee-jerk legislation is never going to be the answer. Education and a shift in attitude from dogs being 'possessions' to living, thinking, feeling creatures, that are deserving of our respect and support is what's needed.
In addition, legislation to ensure dogs are no longer bred and raised on puppy farms or by unscrupulous back-yard-breeders, where they are raised in an environment devoid of the right early socialisation and learning they need to become well rounded, sociable adults would go a long way towards eliminating many of the dogs that are bought without a thought for their background and then have their problems exacerbated when they go to homes that lack the knowledge and understanding they need to train and look after them, let alone help them get over their poor starts in life.
I would be willing to bet a substantial amount of money that none of the people sitting nearby when the JR bit your daughter had any meaningful knowledge of dog behaviour and communication and had missed multiple warning signs that the dog was stressed and upset in the company of toddlers. The dog will have given you lots of signs that they were unhappy, but will not have been 'heard' and therefore felt it had no choice but to escalate the situation. Tragic for everyone involved, both human and canine, but ultimately the responsibility lies with the adults who put both the dog and child in that situation. Dogs do not only 'act on instinct' they do 'think' they have emotions, they feel fear, panic and stress just like we do and in all likelihood, the the dog in the situation you have described is likely to have done everything it could to try and communicate it's fear/stress to the humans around it before it chose to use it's 'last resort' of actually biting.
Your post, deliberately placed in the Doghouse, populated solely by dog-lovers, was clearly intended to stir up a fight. However I think you'll find the people on here are more than educated about the importance of understanding our dogs and making sure our dogs and children are never left alone together - you are preaching to the converted in that respect and I doubt you will find anyone here to back your ridiculous ideas on totally unrealistic and unenforceable anti-dog legislation.