It’s certainly true that some number of people who are looking to carry guns will be less likely to if they know they are going to be searched. But Kelly’s formulation leaves out the hundreds of thousands of people who have no such intent and are simply unlucky enough to be caught in the wrong skin. Those unfortunates must simply pay the tax of societal skepticism.

The dragnet tactics don’t taper at the borders of black and brown communities. If anything, they expand. Last year, The Associated Press reported that the N.Y.P.D. has organized a network of agents and informants strictly for the purpose of spying on Muslim communities. The appropriately dubbed “Demographics Unit” has extended its reach along the Northeastern seaboard, sending informants to spy on Muslim rafting trips, mosques in Newark and Muslim organizations at Yale and the University of Pennsylvania. The Demographics Unit did not discriminate, at least among Muslims: second- and third-generation American citizens were subject to profiling. Despite this sprawling fishing expedition extending up the Atlantic coast, N.Y.P.D. officials admitted in a subsequent court case that the unit’s work had not yielded a single lead, much less the opening of an actual case.

It is often said that Obama’s left-wing critics fail to judge him by his actual words from his candidacy. But, in this case, the challenge before Obama is not in adhering to the principles of a radical Left, but of adhering to his own. It is President Obama’s attorney general who just this week painfully described the stain of being profiled. It was President Obama who so poignantly drew the direct line between himself and Trayvon Martin.

It was candidate Obama who in 2008 pledged to “ban racial profiling” on a federal level and work to have it prohibited on the state level. It was candidate Obama who told black people that if they voted they would get a new kind of politics. And it was State Senator Obama who understood that profiling was the antithesis of such politics. Those of us raising our boys in the wake of Trayvon, or beneath the eye of the Demographics Unit, cannot fathom how the president could forget this.