Here's one in today's paper. 3 year old North Carolina boy found the gun behind the register at a store his father was working in. Father was nearby, rolling quarters. Doesn't say the make of the gun, but surely no 3 year old figured out how to disengage a safety.
http://m.nydailynews.com/news/national/boy-3-dies-accidentally-shooting-gun-article-1.2493719
As for them failing in "games and training", I say who cares? Nobody died, did they? Losing a point at a match isn't as bad as someone losing their life, is it?
As for training, I just don't get that. Never have forgotten to disengage the safety. I Sweep off on every drawer, so if it somehow had gotten engaged, it's off on the draw. As a matter of fact, I keep the SR-9 cocked on an empty chamber with full mag. Last month, my alarm went off at 2 AM. Gun was out of safe next to my bed, safety disengaged, and round racked in with no thought at all. Turned out to be a faulty sensor.
Again, both sides have pros and cons. In the extremely unlikely scenario that I am being attacked, and the even more unlikely scenario that I will fumble with that safety, I guess I am screwed. But since routine gun handling is how the majority of accidental shootings happen, I'll err on the side of caution.
And here's another fact: more people are shot due to accident or negligence every year than those lawfully shot because of criminal actions. A safety wouldnt prevent every one of those incidents, but it has surely lessened them.