How bad must it be when the NY Post is the voice of rational, intelligent thought? How many New Yorkers must die before the mayor brings back stop-and-frisk? By Post Editorial Board June 1, 2015 | 8:46pm Modal Trigger Officers practice their stop-and-frisk procedure at training facility in the Bronx. Photo: Warzer Jaff Just how many New Yorkers must die before Mayor de Blasio lets cops bring back stop-and-frisk? Stacey Calhoun has a right to know. His nephew Jahhad Marshall — a 23-year-old aspiring chef — was caught in the crossfire and shot to death in Queens early Saturday, one of four horrific murders this weekend. “We need stop-and-frisk,” a teary-eyed Calhoun told The Post. “Somebody has to put their foot down.” De Blasio famously ended the NYPD’s aggressive efforts to spot hidden guns and knives by stopping, questioning and sometimes frisking suspicious characters. Through Sunday, city murders are up 19.5 percent in 2015; shootings, up 9 percent. Yet the mayor calls the rise in killings — now 135 dead, versus 113 at this point last year — “small” and lectures New Yorkers to focus on the “overall crime rate,” which is down. OK, New York’s murder total is far below the 1990 high of 2,262. But this year’s climb suggests the city is headed in the wrong direction. How high does the toll have to go — 500? 1,000? — before it’s too much? Yet City Council Speaker Melissa Mark-Viverito and her allies want the cops to stand down more, easing back on enforcement of low-level crimes and even decriminalizing some. Hello? If the city’s murder spike doesn’t trouble de Blasio and Mark-Viverito, maybe the spikes in other cities should. Baltimore registered more murders in May, 43, than any month since August 1972. Killings in Chicago, year-to-date, are even higher than in New York, though Gotham has three times as many people. Other cities, like St. Louis, have seen fresh killing sprees. Why worry about those towns? Because they offer vivid warnings of what can happen if a city isn’t vigilant about policing. The carnage in St. Louis may partly result from cops pulling back after Michael Brown’s death in nearby Ferguson. Ditto for Baltimore after the Freddy Gray riots. New York saw its own brief “cop slowdown” in response to de Blasio’s anti-cop rhetoric after the Eric Garner tragedy. But Hizzoner’s stop-and-frisk ban intentionally ties cops’ hands, leaving city streets potentially awash in guns. And blood. Presumably, even de Blasio would uncuff the police and bring back a serious stop-and-frisk program if the city’s murder rate grew high enough. Of course, that’ll be too late for all those murdered while he waited.