Attorney General Barr ordered the entire Lafayette Park area cleared, quite a while earlier than it was finally accomplished, since those present as peaceful protestors needed time to find transportation, and return to their residences, to comply with the Mayor's Curfew, as I recall.
Peaceful Protestors follow Police commands, and want to be reminded of Curfew(s) in time to fully lawfully comply, of course, and quickly left the area, headed to their residences to comply.
Uncooperative persons remained, violating the Police Commands, and threatening Officers who began a sweep of the Park, encouraging stragglers ahead of them to vacate, and comply lawfully... and responding to illegal activity as necessary, in order to comply with the order given by the U.S. Attorney General to clear the area.
The Church noted, the one illegal arsonists has burned a day or more earlier, sits at the NorthEast corner of Lafayette Square, and the President decided to lead his guests to that Church, following a meeting he held at the White House. He knew the AG had ordered the area cleared, and expected U.S. Secret Service to take the steps necessary for his Church visit, which they and Park Police did, of course.
No peaceful protestors remained in the area, obviously, as peaceful, law abiding citizens and others had left, following Police Orders, attempting to fully comply with the Democrat Mayor of Washington, DC's Curfew Order.
By definition, the peaceful protestors having left, the remaining persons, if any are considered willfully in violation of the Attorney General's Order, and non-lethal means were employed to remove same, and enforce the Curfew, and Police Orders.
President Trump, and his group, not being subject to the Police Orders, or Curfew, expecting compliance by all in the area, one way or another, strolled calmly to the Church, and faced the usual Washington Press circus when Press members, crews press for space, and when 'Reporters' may vocalize random thoughts/questions.
Leftist Reporters and Commentators characterized the events as they wished, with little regard for the reality of the day's events. I presume you read those reports.