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"You never want a serious crisis to go to waste," Rahm Emanuel, then a congressman, said shortly after the 2008 election. "What I mean by that is that it's an opportunity to do things you think you could not do before."

So it is with gun control. Every slaughter is an opening to capitalize on grief and hope the public gives government license to do what it previously rejected.

Of course, not all slaughters are exploited equally. Chicago, where Emanuel is now mayor, is on a historic killing spree, with more than 500 murders already this year.

Chicago has an ongoing mass murder problem, even as it has among the nation's strictest gun control laws, to little effect. Yet the Democratic media rarely mention the slaughter there or in Baltimore or Detroit, all of which take place under Democratic mayors with very restrictive gun laws.

Murder carried out daily by illegal handguns, and involving mostly the death of black males living under liberal mayors, doesn't motivate the national media. Could it be that there is no political advantage to be had, and thus no business interest in the carnage?"