Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity. --MLK Jr.
Liberals are sincerely ignorant. By which I mean that they are committed to, and passionate about, their ignorance--truly they are. And they are conscientious about their stupidity--that is, they are painstakingly precise when it comes to being dim-witted.
Ignorance: Lack of knowledge or information.
Conscientious: To do one's work or duty well and thoroughly.