Climbing everest without a guide was only banned because as the highest peak on Earth people want to climb it just for the achievement of it, not because doing it extremely dangerous - that are far worse mountains to climb in the world, ones where you are almost guaranteed to die, and it's perfectly legal for anyone to just go and try. My point is - legality of doing something shouldn't be correlated with the dangerousness of doing it(except where others can be harmed, of course).