The trial in the court is a legal challenge. I don't really have a problem with Trump (or Biden) supporters being rallied. Why does "rally his base" have a bad connotation in your mind?
My take is that the federal government has accrued far, far more power than was ever intended. The entire population of the US has to fight over who is in charge at the federal level in order to live their lives the way they would like.
The founders had the right idea - a federation of states with a variety of laws that the people could choose among, glued together by a weak federal government.