You're right, most do ignore it, and it's why I roll my eyes when the right is accused as being nazis in politics.I actually think you're on to something here...but if you replaced 'forgetting' with 'ignoring,' you might be even closer. Libs in general tend to never let inconvenient facts sway them from their opinions, so they just plain ignore those facts as if they don't exist. Maybe 'willfully forgetting'??
I also have seen people who believe in America that use the word democracy instead of a republic when talking about the way the government in the u.s is ran.
I personally believe this is due to the lie being repeatedly told on tv and has people over time just believing it over facts.