There's nothing irrational about honestly believing the group-consensus if you don't have the skill foundation to see how it could be wrong.

Actually he is right. Just because you can't find a flaw with common consensus dosen't mean you are ignorant or stupid because its perfectly possible there is no flaw with common consensus on a particular subject or that the flaw is too difficult to detect by the means available to you. Perhaps its too difficult to detect the flaw with the means the entire society has available to it!

A rational agent is not an omniscient agent after all!

I think you may be letting yourself slightly adversarial in your thinking here because you perceive this as a fight over a specific thing you estimate society is delusional about. Its not, its really not. Chill man. :)

Edit: Considering the downvotes, I just want to ask what I missing in this comment? Thanks for any help!