Mostly, yeah. Those places have to be guarded, but you don't need investigative expertise. The cops who used to be stationed there have been sent to Northeast DC and are rounding up criminals. I've been pleasantly surprised how much the DC rank and file cops are cooperating. Unlike the pols.
You don't even actually understand what's going on but okay, I'm sorry your history teacher failed you and your school didn't teach you what the act powers of the executive branch are supposed to be
Law enforcement is an executive function (that's why there's a Department of Justice). So is use of the military. There's no question of state vs federal law, the District is the creature of the federal govt and has no constitutional right to local jurisdiction.