Why do you think there has been no real serious academic inquiry into stupidity?

Einstein said that there were two things that were infinite: the universe and human stupidity. And he also said that he wasn’t too sure about the former.

Marx said that stupidity was the third most important driving force in civilization, behind capital and violence.

So how is it that there is no serious academic research regarding stupidity? Is it partially due to that it’s so hard to define? Is it that finding subjects (human or situational) is too difficult without making a subjective judgment?

When it seems to be everywhere, why can’t we nail it down?