Always suspect the "common knowledge." Not just this, but if anyone uses "common sense" as an argument, run away in fear. As far as I can tell, "common sense"

Always suspect the "common knowledge." Not just this, but if anyone uses "common sense" as an argument, run away in fear. As far as I can tell, "common sense" is just code for one of (A) "I'm too lazy to provide a rational explanation"; (B) "I don't think you're worth explaining to"; (C) "I don't think you're capable of understanding"; or (D) "I don't have a real explanation, but I still need to assert the truth of my claim."