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For people that are smarter than normal, there may be a tendency to talk down to people, i.e, correct them..."How can you be so stupid?"

and I am laughing at myself while I type that, because it is very typical of me,

there is a great article that "explains" human "stupidity"
http://www.prettyfedup.com/pfu/philosophical/whyarepeoplesostupid.htm

Thanks I will check it out:)