Wannabe, well said!
I work in rescue. I save dogs from pounds on an almost daily basis and work hands-on in my local independent dog rescue.
In all the years I have done so I have never seen a pit bull and I doubt if those I work with have either. We see hundreds of Staffies, 99% of whom are abandoned to the pound or thrown on the streets to be picked up by dog wardens and are so often PTS.
However, many of those which I have dealt with go on to be assessed by rescue and into checked family homes with great success, though many more are still waiting at the gates for similar loving owners.
We already have legislation on dogs - the rushed in, ill thought out Dangerous Dogs Act. This stupid law allows the Police to impound any "pit bull type dog" - i.e. anything that they think looks like a PBT. Case studies have shown that even non PBT have been taken from families and killed on the basis of a complaint that they "look like a Pit Bull". If you read the Deed Not Breed website you'll see what I mean.
The problem with PBTs here in the UK is that they are a banned breed unless under strict regulation so those found here are often bred to fight and are indeed a problem. However in Ireland they are legal (under specific regulations) as they are in some US states and the vast majority in these countries are super pets.
As soon as a tragedy like this occurs it is assumed that A. the dog is a PBT or SBT and B. These dogs are dangerous.
As a rescue worker, former SBT x owner and current large breed owner (one of which is a GSD), I am convinced that generally neither is the case.
My message is simple - a dog's behaviour is the result of its environment and it is the DEED, not the breed, which should be blamed.