My father-in-law IS a rocket scientist, worked for NASA and other agencies with a top, top secret clearance and I have never met a man with less common sense.
He does vote Republican though.
My uncle is a goose-stepping union supporting marxist.
As my father told me, endlessly (well it has ended, and I wish it had not), book smarts, which is what it takes to be a rocket scientist, and common sense, are two entirely different things. He knew I had the former, and was secretly proud of it, but always said I didn't have a lick of the latter, possibly with at least a little justification.