It always amuses me to watch the optimism of gun fanatics who believe they're preparing themselves to resist with their shotguns against a state that has drones and nukes at its disposal.
Cliven Bundy makes this seem quasi-justified, sadly enough.
Also... Nukes? Useless in this sort of situation.
What is something you used to believe, preferably something concrete with direct or implied predictions, that you now know was dead wrong. Was your belief rational given what you knew and could know back then, or was it irrational, and why?
Edit: I feel like some of these are getting a bit glib and political. Please try to explain what false assumptions or biases were underlying your beliefs - be introspective - this is LW after all.