First, stupidity as a behavior, being part of the personality, obviously has a genetic basis.

The saying goes that "like father, like son"

So, just as physical characteristics are inherited, character, the genetic basis of personality, is also inherited. The environment exerts influence on the personality of the individual, character traits manifest themselves in certain circumstances. Alcoholism as a psychiatric illness has a hereditary component, although the person, thanks to his environment, is far from the influence of factors that lead him to have alcoholic behavior, as soon as he comes into contact with alcohol, almost always, to not be absolute, he ends up with alcohol poisoning.

A stupid person, whenever he has the opportunity, will have stupid behavior, from what I understand in this chapter.

Regarding the second law, where proportionality is maintained regardless of group size. So if we use sex as an analogy for maintaining proportionality, it is men who transmit stupidity, it is men who provide sex.

Conceptually, from my point of view, being stupid is trying to have different results by always doing the same thing.

Thanks @DarthCoins for this piece of intelligent knowledge.