I see the show as an entertainment show, not a "how to" show. I would not expect to see them wearing safety gear any more than I would expect an actor firing a weapon in a movie to wear safety gear. They are putting on a show to entertain us, and if they feel they enhance their performance by not wearing safety gear then so be it. It is like a high wire act not using a net, it might be dumb, but it adds to the excitement.
With adult supervision, I would not expect a kid to mimic their lack of safety gear any more than they would mimic the type of "impossible shot" being performed. If a kid thinks he doesn't have to wear safety gear because somebody on TV doesn't, then maybe that kid also thinks it is okay to try to do trick shots and quick draws, and other potentially un-safe activities that he might have seen on TV or in a movie. In that case I would say don't let the kid watch the show.
I am okay with the show as is, and I don't need disclaimers to tell me the acts are dangerous and unwise. Of course, I don't have any kids, so I probably don't know what I'm talking about.
BTW, I am not implying that the shots are in any way fake, just that they are meant to entertain us, not educate us.