The protest itself is about as legal/justified as ICE breaking into Latino churches and arresting people. They had about as much of a legal right to be there as Nick Shirley and his crew think they do when they go from daycare to daycare demanding to see other people's children.
Don Lemon and Georgia Fort filming coverage of a public protest happening in a church (which he was on the other side of the room from), however, isn't a crime. The only reason they were even arrested is so Trump and his fans can get a small hit of dopamine off of the headline "BLACK PEOPLE ARRESTED AND CHARGED UNDER KKK ACT" and "DON LEMON ARRESTED", even though the case will go nowhere.
He's a journalist who was filming the protest. It doesn't matter whether or not he knew the protest was going to happen, reporting on it is as much of a crime as the people in the pews recording videos of the event (which is to say, neither are illegal).
No evidence of that.
He was interviewing the church staff.
He made an observation about the families leaving the church and the obvious discomfort that protest causes. No evidence whatsoever the protestors were paid.
