I watched a video where people were screaming they saw the shooter climbing up to the roof several minutes before he fired a single shot. During that time the SS should have ushered Trump off the stage. TOTAL INCOMPETENCE!
It means that the people on stage were not notified by those SS agents who had the relevant information.
The failure of communication is not incompetence. It is not negligence. It is not a mistake or an oversight.
It is intentional.
It is criminal.
It is accessory to attempted murder.
Those who attempt to cover it up after the fact are guilty of a criminal conspiracy.