There is painful irony to the message that President Trump delivered Friday in Brentwood. Speaking to a group of police that included members of all of the East End departments, Mr. Trump ostensibly addressed the violent MS-13 gang. But he also told the officers and assembled police brass that they should feel free to rough up suspects. A White House spokeswoman has said that he intended the off-script comment as a joke. If it were a joke, it showed unfathomable insensitivity; if Ms. Trump was being serious, it showed what seems like criminal depravity.