Americans have repeatedly rejected an expansion of gun control because it doesn’t work. Look no further than Aurora, where both the city and the theater where the shooting occurred have rules forbidding the carrying of any firearms (the city statute was deemed unenforceable, however, because of the state’s concealed-carry permit statute). On top of that, no one can fire a weapon within Aurora city limits except at gun ranges — not even, apparently, in self-defense. Of course none of that stopped the perpetrator in this case from committing the murders.