Handgun safeties
Without getting into internal firing pin locks, why is it that when a Glock firearm is held and shot (and I use a Glock only as an illustration,) can one load and fire the firearm in one motion, no thought required as to releasing a safety, point and shoot, the same on a (Colt and almost all other revolver manufacturers), revolver, no external safeties, great in high stress adrenaline moments, no fine motor skills.
However once Colt produce their semi automatic pistols, as well as many other US and other firearm manufacturers, they all boast more safety devices.
One on the side, the conventional thumb safety, the grip safety, the safety if no magazine is inserted one is unable to fire the semi. Are semi automatic pistols so much more dangerous? Hence on the Glock and S&W M&P this is the reason I find them so attractive. Note on the M&P it is relatively simple to negate the safety lock internally to allow it to fire without a magazine.
Hence why the need for multiple safeties on one firearm but NONE on the other? Any thoughts or way back in Smith & Wessons days were things different.