The Park Service has quite clearly stated:
The protesters were asked to move. Three times.
The protesters (at least some) responded with violence.
Now, I would agree that if the Park Service does not have video evidence of the above, they were rather ill prepared, naïve, or both.
This was making me think about something, so I checked.
Here is a snippet from an article in 2010, when the democrats marched to the house to pass Obamacare:
“As police held demonstrators back to clear areas for lawmakers outside the Capitol Obama’s speech, some protesters jeered and chanted at the officers, “You work for us.”
(I believe that “Obama’s” speech” was “to speak”, but I’m not sure).
So, in 2010, the democrats broke up a protest and used police to push back protesters to make room for them to do a symbolic march to their own building (which I believe has an underground passage from their office). Pelosi carrying not a bible, but her GAVEL:
“House Speaker Nancy Pelosi led her caucus across the street with a gavel in one hand and the other on the arm of Rep. John Lewis of Georgia, who had been harassed by protesters on Saturday. :