Most mishaps are caused bye people , aircraft are safe but when u add a human then the chances of a mishap will go through the roof, Only have too look at other sports weather it be guns ,cars motorcycles or swimming ' every thing can cause harm if not done with the respect it deserves ' u have too try and control all the thing in and around including others to a point but then as i said being human we all make mistakes we should all try to learn from the misfortunes of us all .