You can't even unload a 1911 if it is in safe mode. Recently a guy fired off a round through his Glock in an airport that he thought was unloaded, while trying to show that it was unloaded.
It the safety had been on, that would never have happened with a 1911. He couldn't have pulled the slide back to prove it was unloaded.
And what might have happened when he realized the reason he couldn't pull the slide back was because the safety was on, took off the safety and went to pull the slide back?
Couldn't the same AD have happened?
And if he'd pulled the trigger, nothing would have happened.
Human error. The mother of all AD's.
True.
Safeties. The mechanical mother of human errors.
Can't always keep that child from doing wrong, but she does have some influence.