That’s true, lefties aren’t very intelligent, are they?!
The Leftnicks (my word for the Marxists) are not mentally stable, either.
True, but it's not due to a lack of brainpower. When a person decides to simply accept what his ideology demands (whether it's rational or not), he stop using his brain.
Intelligence (i.e., thinking) is hard, painful work. And it pisses off people who are trying to control you.