There's no indication that smart parents don't get their child to cry less than dumb parents either shorter or longer term, so the entire argument is baseless.
You seem to have completely missed the point of my comment though, which is that the questions are not well-defined and therefore it's not obvious what 'the better answer' is.
In fact if you believe this article, unhappiest people have avg. IQ. Low and high IQ are happy, with >120 being the happiest: https://www.bbc.com/news/health-19659985