Do you mean do say that people of ordinary intelligence, as a general rule, don't actually believe whatever it is they say they believe, but instead just parrot what those around them say? You might be right. I think I need to find a way to re-immerse myself in a crowd of people of average intelligence; it's been far too long, and my predictive/descriptive powers for such people are fraying.
Note that none of this is sarcasm; this comment is entirely sincere.
There's certainly evidence that intelligent people are more likely to have more coherent worldviews. For example, the GSS data shows that higher vocabulary is associated with more extreme political views to either end of the traditional political spectrum. There's similar research for IQ scores but I don't have a citation for that.
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