When I saw the thread title, my first reaction was "it also makes you feel self-righteous and justified to treat your opponents like crap", that I opened it and saw John Cleese's face and knew he'll cover all that and then some!
Thank you for posting it, TuskenR, I have a suspicion that some extremists will be able to watch this and not recognise themselves
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"Facts do not cease to exist because they are ignored." Aldous Huxley