Not only was the murderer of the Pulse patrons an employee of a global security firm the DHS uses as subcontractor to provide security to federal buildings, had been questioned twice by the FBI, was licensed as a security guard, and his wife knew of his plans; It so happens that, when a gun shop which refused to sell him body armor and bulk ammo told the FBI about him, the FBI didn’t follow up.
Read my article, Say something? FBI does nothing