"All of us necessarily hold many casual opinions that are ludicrously wrong simply because life is far too short for us to think through even a small fraction of the topics that we come across." -- Julian Simon
In my experience, neither intelligence nor formal education provide innoculation against this condition. We are all at risk of being trapped by things we parrot without understanding or beliefs, false premises or "facts" we use to construct a worldview. Very few people seem willing to put forth the effort required to chip away at their own ignorance.