Liberalism is a symptom of a genetic trait.  Those who have it lack the capacity for rational thought.  You could put these people in a room piled to the ceiling with facts which disprove something they "believe" to be true.  You could line up 100 experts and have them each explain why the things the affected individual believes are not true.  No amount of facts or effort will change their mind. All cats are animals.  All dogs are animals, therefore, all cats are dogs and catdogs are real.  Catdogs are very rare and must be protected.  Global warming is killing the endangered catdogs!