Clinton’s team did a great job of framing Trump as a dangerous and unstable Hitler-in-the-making. As I noted before, that provided moral cover for her supporters to threaten and physically assault Trump supporters in public.
Adams, Scott. Win Bigly: Persuasion in a World Where Facts Don’t Matter (p. 231).
Just exactly what the Dems and their media did to Reagan during his first term. He, also, was "literally Hitler."
They have never changed.