We are constantly shying away from the fact that some breeds of dogs were bred, over hundreds of years, to be good at killing... on command in theory, but commands aren't absolute. Their jaws and faces are made for it. So even if they're the bestest boy ever, they are still capable of great damage, very quickly, in the few seconds it takes to cause irreparable harm.
Most such dogs will never get triggered. Many may be incapable of being triggered, but there are lethal animals walking our streets and while any dog can be lethal if it runs out in front of a car, the breeds with the most powerful jaws are a particular case and a particular risk. All the "but I trained it well!" waffle can't change that.
But we live in an age where authority means nothing. Any regulations, if introduced, will be skirted within an inch of their legal limits, and some men will continue to walk around with legal weaponry on the end of a lead.
And I say all this with 40 years of border collie experience in the family, and plenty of folk would consider them bad family animals. Nobody's ever deliberately left a dog alone with a child though (though I'm sure it's happened briefly). Collies don't have very powerful jaws, but children don't have very strong faces and limbs.
Ultimately, this thread will go on, more people will die, and nothing will change except for a bit of occasional and thoroughly pointless venting... like this.