That someone can easily dispatch a roomful or two of elementary school children, or college students, or theater-goers, or restaurant-goers with these same weapons is not seen by these people as something that needs fixing—at all. Yes, it's sad that those particular people got murdered, but whether Americans have the God-given right to murder a large number of people quickly, and easily, if they feel the circumstances warrant it is something the tyranny fetishists will go to their graves, or your grave, or the local sheriff's grave believing in.
The other tricky part of this is that (of course) the people most obsessed with defending themselves against government "tyranny" are the people who see "tyranny" in absolutely everything. The United Nations is coming for them; Barack Obama is a crazy Marxist; bicycle paths are a sign of the devil. The most unhinged people among us are the people who have volunteered themselves as the judges, juries, and executioners of any American government figures they've decided they don't like—and those are the people that a large segment of our no-gun-regulations-ever crowd are catering to. Why? You could suppose the NRA, as obvious example, is merely acting as passthru for the manufacturer's lobby, which makes a very sizable income off of crazy frightened people, or you could suppose them to be unironic believers in the tyranny theory of American proto-terrorists someday becoming American freedom fighters—but why does the we'd like to maybe someday be able to kill members of the government theory get so much mainstream love from supposedly mainstream sources?
It seems rather obvious that we could take all the arguments as to why one might need a 30-round clip because of potential tyranny and just flush that entire population from legitimate discussion. If tyranny does come to America, your little closet stockpile is not going to do a damn bit of good against the Air Force, and basing all our public safety decisions around your own little delusion that it might, someday, is not a very good reason for our continued enabling of frequent, convenient mass murder. So that seems a good first step: If you're arguing that people need to be able to speedily murder other people because someday you and your little band of societal malcontents may want to murder the right people, the ones who really need murdering, all of the policymakers concerned with American public safety ought to write off your opinions on the matter from the outset. Then the rest of us can begin to have a discussion on guns in America that isn't objectively, you know, insane.
-Hunter, Daily Kos