The history of mankind has already accumulated a number of examples of the negative consequences of attempts at an overly crude and simplified “designation” of some biological species, families and even ecosystems as unambiguously useful or unambiguously harmful. Drainage of swamps led not only to a decrease in malaria mosquitoes, but also to more violent spring floods when nearby fields were drained in summer, the shooting of wolves (“offenders” of deer) on a closed plateau – to an immoderate increase in the number of these deer, their almost complete extermination of food and the subsequent general case.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.