"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 Best of the Leon Russell Festivals" DVD