I am not a bull breed fan at all, but it's not fair to lump them all together in any way. Pedigree Staffordshire Bull Terriers are not a large dog, and although they can be troublesome with other dogs, well-bred ones have been present in huge numbers in this country for time immemorial without these problems. Ditto properly bred English Bull Terriers and Mastiffs/Bullmastiffs.
The majority of the dogs that are labelled 'Staffies' these days barely resemble the actual breed. Lots of the mastiff types include all sorts of other breeds (and people seem to think that labelling something a mastiff will hide the fact that it's an XL bully - one of the recent deaths was blamed on a Bullmastiff, but it was apparent from photos that it was nothing of the sort).
These recent dogs are just something different altogether. Call them what you like, but they are clearly a huge issue for temperament and gameness. People who think they are in control are sadly at risk of finding out they are very wrong.
I saw a post the other day on one of the articles about an attack from a mother who had young children and three XL Bullies, but that was fine because 'she never left them alone together'. You just can't educate these people that it will make no difference whether they're alone or half the family are there, no-one will be stopping them if they do turn on the children until it's too late.