It's not a new argument, but it's updated, and most excellent:
It’s the black poor—the primary victims of violent crimes and thus the people most in need of effective policing—who must live with the effects of these falsehoods. As the Black Lives Matter movement has spread, murder rates have climbed in cities across the country, from New Orleans to Baltimore to St. Louis and Chicago. The Washington, D.C., homicide rate is 43% higher than it was a year ago. By the end of August, Milwaukee and New Haven, Conn., both had already seen more murders than in all of 2014.More.
Publicly, law-enforcement officials have been reluctant to link the movement’s antipolice rhetoric to the spike in violent crime. Privately, they have been echoing South Carolina Gov. Nikki Haley, who said in a speech last week that the movement was harming the very people whose interests it claims to represent. “Most of the people who now live in terror because local police are too intimidated to do their jobs are black,” the governor said. “Black lives do matter, and they have been disgracefully jeopardized by the movement that has laid waste to Ferguson and Baltimore.”