I don't blame the school at all - or the government, really.
The problem is that if little billy breaks a fingernail, the parents are poised ready to sue for damages for all the mental anguish and future loss of earnings. Because of that, the school has to be insured and have 'watertight' H&S policies so they can get away with the bare minimum and/or have their insurance cover any losses. :-/
Now.. if we could somehow stop people for suing each other for accidents..
I agree. It's easy to say how stupid it is, etc. but if I were responsible for a school and the hundreds of kids therein I would be walking on eggshells, and there certainly wouldn't be any sledging, more's the pity.
Yes, we all had impromptu treats such as this back in the good old days but these days everything must be risk-assessed, the proper insurance cover put in place, it must be tested to be accessible, inclusive, politically correct, environmentally friendly, etc... If you didn't lose the will to live half way through the inevitable box-ticking exercise you'd find it was spring by the time you'd finished.
It's our culture that's at fault. We reap what we sow.
Kevin