No one is so totally oblivious that they refuse to change their mind about whether or not minds can be changed in the face of scientific evidence to the contrary. For that matter most people do not completely discount evidence that disagrees with their viewpoint.
I strongly disagree with your claim that anyone who tells you not to talk to someone who refuses to change their mind in the face of ample evidence is probably a troll, and that even if they’re not, they’re not worth talking to, is part of the shadow government trying to drive the left and the right apart.
For that matter I really don’t know how anyone can seriously argue for political unity now that Trump is quoting Mussolini.