My workplace provided "active shooter training" in which a police officer demonstrated a potential way for a group of unarmed people to disarm a person with a gun. When one of my coworkers asked "What if they have a knife?" the officer replied with something to the effect of "There's no good way to disarm them without getting your hands cut up, I'd much rather face an assailant with a gun than a knife."

Cold weapons _are_ more dangerous at near distances, than guns.

The gun has exactly one business end and you know how it is going to be used. An attacker wielding a knife can use multitude of moves, how to attack.