STEPHEN HUNTER: Why 33 rounds makes sense in a defensive weapon. And why there should be no ban on full-capacity magazines. “Those who would ban extended magazines, will say that although hundreds of thousands are in circulation and thousands more will surely be sold before a ban is enacted, it will be worth it if it saves just one life. But the other half of that question must be asked, too: Is it worth it if it costs just one life?” I don’t think they care how many lives it costs.