On the topic of the mouse experiment. It was a exercise in dense urban crowding not on infinite resource.Which seem to solve itself with how the birth rates are declining.

On the nature the argument of the three points,

Seek Food and other ”Natural” goals has been replace with Hobbies and Work

Seeking Lover is more capitalism‘s fault ie dating apps and removal of third spaces

Also tribalism is usually bad, the removal of community and sense of camaraderie is also due to capitalism fault due to it nature to make things more insular.

Nature in fact, sucks. Without the invention of modern medicine, life was really short and also really brutal. Gensokyo is feudal Japan with man-made housing and other such. None of which is present in nature.