If I'm ever fitting a piece of carpet (badly, as Mrs C will verify) and can't find something to cut it with, I always pop down to Titchfield Primary School and get one of the children to buy me a good sharp knife at the Christmas Fair, where they are much cheaper than at B&Q.
When I saw the story here, I was quite appalled (you'd think the Sun could do better than those two ruffians, wouldn't you?) and then I laughed as I recalled my Junior School teacher who used to reward whoever was first to finish their sums by sending them out to the local newsagent to buy her 20 cigarettes. If she had sent us out to buy an axe or a meat cleaver (both of which the shop owner would probably have cheerfully sold us, as long 'as long it's for Miss Jenkins, mind') I think there would have been a slight temptation to 'muck about a bit', maybe scratching a few lines into a tree, or waving it about and chasing each other making noises like a Red Indian (whilst casting uneasy glances around for any watching adult who might report us to school.)
The point I'm trying to make is that we would never have considered stabbing Paul Williams from Class 3 even if we didn't like him much. Whilst I'm sure that the vast majority of kids nowadays wouldn't either, how have we got to a point where a small but significant percentage of them will do? I know that there was a knife culture in the 1950s when my father was young, but I don't think that adults were frightened of children then.
I can't help but fall back on my usual line of reasoning that people do things that they have never been convincingly told not to do and also things that they think they will face no real punishment for doing.