That's exactly the reason why my Mum and Dad would freak if got a motorbike. My Dad's a retired teacher and in the twenty years he spent at his last school he's had at least a dozen kids die before they reached the sixth form, almost all where killed on motorbikes and mopeds. The majority of accidents were the fault of other people.
A friend of mine lost her brother in a motorbike accident, so to see those blokes dicking around and coming a cropper reminds me of how stupid some people can be. It also reminds me of the purpose of the Darwin award...