The problem with this is the application, or lack of, of 'common sense'. If a competent young child is competently supervised, than there should not be a problem. But there is a foolhardy minority, who will ruin it for others, by ignoring 'common sense', because it does not apply to them. The same thing as with drinking on the boat, and boating on the tidal Thames (two issues which are currently hotly debated in separate threads).
I mean, to that brigade, it is probably a god given right to be sat in the lounge, drinking alcohol, whilst the young'uns steer the boat under a red sign bridge arch...
after all, nobody has been killed like that yet, so it is o.k....
bottums up...