It's film footage, film footage is there to be viewed. People died in nearly every one of those crashes, I know a couple of the airshow crashes killed people on the ground. The B-52 crew, the Lufthansa jet, most of the helo crashes....people lost their lives in all of them.
Maybe when you post stuff like that you could just warn people, "images of fatal crashes" or something. Myself, if the cameraman took the time to follow the action, I'll take the time to watch it.