Earlier quoted context omitted.
People don't see a gun and decide to use it. They decide to hurt someone, then look for a weapon. If it's not a gun, it will be a knife, or acid, or poison, or fists, or a vehicle...
This actually isn't well backed up by psychology. The large majority of violent crimes aren't premeditated--they're impulses.
That is, they don’t see a gun and decide to use it; they decide to use something and see a gun