Yer both wrong - hammer fired DA/SA or DAO Autos are The Bomb. Well, for me and my training level anyway. Decocker down when holstering disables the trigger and firing pic - the gun is dead as a stone. Once holstered the decocker is raised and the hammer put at half cock. If need arises, I skin it and a neat sharp DA pull (which on my Beretta PX4 is better than a Glock squirt gun trigger) lets round one go and then it's in SA mode for fast follow ups. 17+1.
When time to holster the gun the thumb decocks the pistol and it is once again inert and safe to be holstered even with shaking hands from adrenaline rush.
DAO Autos are even stupid simpler - like a DA revolver. Draw, point, and pull.
To be fair I trained with some cops a few years ago with replica laser cartridge pistols in realistic high stress simulations and we'd video it and watch. You can't believe the number of guys who had their fingers on the trigger even though they insisted they knew better and had the muscle memory to not do that. It happens - people, even people with high skill levels and tons of training, can end up with their fingers where they shouldn't be when SHTF. They don't/didn't believe it could happen until they watched the videos. No matter how well trained, fuck ups happen. I prefer redundant safety systems in place. Unlike Glock Perfection, I'm not perfect and can fuck up and I'd prefer to not get shot or shoot anyone else who dun't need shot.
VooDoo