Nothing new there. In all cases of severe attacks by dogs, the dogs are destroyed and rightly so. There is a massive outcry, what would you expect? Its a pretty gruesome case, fortunately such cases are incredibly rare.
No demands that I have heard to change the law, but some people have commented that whilst you need to prove your competence to drive a car, no such burden of proof exists for anyone to own a dog, a point of view I would agree with.
As to the stabbing incident, what do you mean, where is the publicity? shed loads of it, from what I have seen. Since no details are currently available, not much there for people to comment on re tougher sentences etc.