The National Rifle Association’s response to the Sandy Hook massacre is crazy. Duelling with a bad guy with a gun rarely takes down the bad guy with a gun. It generally leads to more innocent lives lost ... and among them, the good guy with a gun, (see the fate of the father-in-law in “Fargo”).
In a crime scene where everyone is being shot, the insanity and indecisions of a firefight are more favourable for the bad/now-crazy guy with an automatic weapon. Unless you have clear shots and a good gun, the odds are heavily against you. Seek cover. Assess risks. Act in the interest of yourself and the people you are with.
A single shot revolver is incrementally inaccurate over distances and no match for an assault rifle or handgun in the hands of a bad/now-crazy guy. The National Rifle Association of America and their signators in Canada are paranoid schizophrenics in their pursuit of arming everyone so that they can preserve their hobby of pretending they are soldiers ready to assault their government whenever enough of them decide to.