"Communism killed more people than the Nazis did!"

Why does this oft-repeated piece of apologetics keep getting repeated on an endless loop all day long by the Right?
Is it a veiled means of inoculating against criticism of Nazism.
What is the expected response, something along the lines of
"Hey, I might be a Nazi but we're better than the commies!" ??
The only people pushing the Athenian Straw Man Nonexistent Threat of Slippery Slope Windyfoggery (ASMNSSW) RE DEMOCRACY are people who have a misunderstanding/problem or hatred of democracy. (See AUTHORITARIANS)