Fortunately, this is not the attitude in commercial aviation, in workplace safety, nuclear power, and other industries. While I could maybe accept that some feel that way with respect to participants in the events, it is another thing entirely when innocent spectators are hurt. Both instances I mentioned could quite easily have resulted in serious or fatal injuries to spectators. No waiver form is going to protect you from getting sued, as the courts of held that someone cannot waive gross negligence. And who will make the decision on what's gross negligence on the part of the event organizer or pilot or both? A judge or a jury. One doesn't have to look very far in the news for information on how those tend to go when negligence is involved. Seven figure payouts are quite common.

If you want to take the opinion that "risks can't be totally eliminated," that's your business. But hurt a kid badly at an event and see how expensive it gets - and how fast.