Stab in the back redux

Mark Kleiman has a request.

I know that supporters of the currently ruling coalition of crooks, warmongers, torturers, incompetents, and theocrats are deeply, deeply hurt when they and their pet politicians are compared to Nazis. But could someone suggest to them—politely, of course—that it would help if they stopped borrowing Nazi iconography and phraseology?

Kleiman is talking about a particularly vivid example of one of my favourite subjects, the dolchstoßlegende.