1. Gun control proponents' interpretation of the Second Amendment must prevail at all costs.
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Keep in mind a few points with regards to that:
(1) Our Founding Fathers enacted the 2nd Amendment from the get-go.
(2) The Government didn't fear "the people" having guns.
(3) The Government made absolutely no intent to "disarm the people" ever. Not ever. 
(4) Thus "guns" have never been the problem. No one looked at Jesse James and talked about disarming the entire nation. 
(5) Before the days of metal detectors, some people took guns into ballparks, concerts, and even on airplanes and ships....and no one really cared....and we didn't have the mass murders we do today.
(6) But something did change.....and what changed is what is "moral" "right" "good" and "defensible".....and it is that "change in attitude" that has resulted in the fact that 24 of the Top 25 Mass Murders in the US occurred in the last 40 years.....and not during the Wild West days nor the Gangster Days of the 1930s.