And, yes, we will argue again about guns, or, rather, about why our politicians are hardly even arguing about guns any more. There are those who will object, who will say gun policy has nothing to do with any single event, that tragedies should not be exploited for political purpose. We know many of our readers are among this group.

And then there will be others, ourselves included, who will say, whatever the facts of this case, that the country would be safer with fewer guns, that mass killings are more difficult with knives, that it is not the Second Amendment but political cowardice that precludes sensible regulation. That we are not supposed to exploit tragedy to talk about this issue, but that in the absence of tragedy it never gets talked about at all.