Apparently someone chose to close his eyes to "peaceful" rioters burning a church and attacking the white house.
In other words, good luck with that.
They were not rioting when Trump had them attacked to make way for his blasphemous photo.
How were you going to make them move? Ask politely?
Peaceful protests are sometimes, seemingly, a guise for a riot later on in the night. You must assume these tactics are in play by the agitators even during the day.
The time for diplomacy has passed. The time for speaking softly has passed. No tolerance.
Also, were you expecting the president to walk into a mob of protesters? Or were you hoping he would for a negative outcome?