Editor’s note: This article describes racist imagery and slurs. In early June, an ice cream truck jingle rang out in Brooklyn, yet it drew no children, produced no soft serve, and evoked no nostalgia. It was midnight, and it came from an unmarked NYPD cruiser. It was the third night of an 8 p.m. citywide curfew, issued by Mayor Bill de Blasio, ostensibly to curb looting and violence. Despite the order, peaceful protests continued well past 8 p.m. It was around 11 p.m. in the historically Black neighborhood of Crown…