Devil's advocate time, Pocon1, the primary use of a weapon in a self-defense scenario is psychological. If the 'victim' produces a weapon, it tends to have exceedingly negative effects on the morale of the assailant. Gun or knife, it changes the situation. While I am on your side as to choosing a gun over a knife, the simple fact that a knife strikes you as less lethal is moot in the majority of cases.
Actually, a retired police officer that I know is of the opinion that he'd MUCH rather be shot than stabbed, given an option. The two times he was stabbed were FAR more painful and took much longer to recover from than the time he was shot.
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