Any evidence anyone was prevented from voting by these trump supporters?
There is evidence that they violated the law that prevents electioneering within x feet of a polling place because they were forced to move. And as always, ignorance of the law is no excuse for violating the law.
I really do agree with your point because I am in favor of following the letter of the law unlike some Democrats with regards to BLM protests. I just think that this is a non issue. They did not cause any active harm to anyone and complied when they were told what they were doing was technically illegal.