You can not even catch a fish from the pond. It turns out the psychopaths of the proverb are perceived quite differently. Specifically. They can live and not eat fish, because there is no pond near by.
A person requires some kind of justification to describe his person. Adjectives define his physiology. Aligophrenia, mental retardation, of course carries a medical symptom, but such stages as the imbecile or the moron who is able to live in the environment, support conversation and go to work, in my opinion is not at all sick. If a moron and an ordinary person put into nature, in previously unknown conditions, then it is not known who will better learn. By and large, all this gradation, is based on rules, rather than the naryual human bodies of the goose ....