Based on real world experience, if you allow everyone to arm themselves, then the threat will escalate. Instead of using a firearm, Mr. Psycho will switch from a directed attack to something with an area effect, such as a car bomb.
Unfortunately what will happen is this will be used to ban more guns and make them harder to obtain so the exact same outcome will happen when the bad guy can't get a gun he will just turn to something like a bomb.
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