Guns aren't dangerous. Idiots are dangerous.
Many years ago when I wore a hairy brown suit and a matching iron hat I learnt about loaded pistols. A safe autonatic pistol has the action forward and the safety catch set to safe before the magazine is fitted. A safe revolver has the hammer resting on an empty chamber and safety catch set to safe. A doubly safe pistol of either type has been checked by a competent handler to be in this condition and then left in its holster. To do otherwise is the firearm equivalent of forgetting to lower the undercarriage before landing.