Let’s set aside for the moment the question of whether it’s appropriate to talk about gun control in the wake of the shootings in Aurora, Colorado (though I can’t think of a more appropriate time to talk about it). And let’s not consider whether it makes sense that it’s legal to buy thousands of rounds of ammunition on-line in the U.S, without any background check (though could it, really?) And let’s not revisit that old argument about people, and not guns, killing people (though millions of “people,’ including evil and deranged people, do seem to live in countries with negligible...