It wasn't a failure. It was intentional misuse to misdirect resources that should have been investigating someone else and other, very real, crimes.
Those crimes were known to all the players in the investigation.
Those individuals bought time for the destruction of evidence of those crimes, UNDER COLOR OF LAW.
Those same people knew full well what they were doing, who they were doing it for, and did so as enemies of the People of the United States of America, hoping to overthrow a duly elected government.
There is only one word for such behaviour: TREASON.
Every one of them should be swinging from a gibbet, lamppost, or tree branch.