re: #7 Obdicut

The best way to reduce gun deaths is to reduce crimes like murder and gang activity. Training and all that is about reducing accidents.

Unfortunately Colt has been slow to make seatbelts and air bags available on handguns. (Just kidding a little levity might be a good thing here)
Actually the classic Colt model 1911 in modern form has no less than three safeties. Grip safety, thumb safety and internal slide/sear interlock. It always had 2.