Personally speaking, I have a relatively high I.Q. but that knowledge likely contributed to me staying in longer than necessary. I actually thought I was SMART enough to be able to find "The Truth".
Irregardless of intelligence or stupidity, it is unnatural for people to be able to close their eyes and mind to all of the evidence to the contrary of there being an "absolute truth". In order for this to happen, they have to turn off or numb their minds from anything other than their own SMALL world. This may give people the impression that they are less intelligent. I would suggest that it is denial. Denial and blind faith that kills peoples' psyche. POOR CHAPS!!!!