Especially on such a momentous day in the Capitol which it would have been even if there had been no rally. It is not in any cop's nature to usher crowds of upset people past security measures in any situation anywhere in the world.
That is why I feel confident that they were ordered to do so.
You would think rally or not, they would be on high alert with officers in strategic places. The crowd appeared to be loud but peaceful not trying to force the gates when all of a sudden, come on it everyone!