argumentum ad naturam — a rhetorical technique for presenting / proposing that "the more natural something is the better".

yet, many phenomena present in nature are considered undesirable even by supporters of this argument, such as diseases, parasitism, famine, natural selection, natural disasters. at the same time, many phenomena absent from nature bring benefits, such as medicine, health care, support for the elderly and disabled, agriculture, plant selection.

nature & ecology is important for suffering less — but just as medicine, agriculture & mutual aid. wild animals getting eaten alive don't seem to suffer less than domesticated. 

 He dont said this, read again.

He basically pointed out:

Artificiality is part of man's nature, but it is harmful when it corrupts man's own nature. Do not corrupt your nature, return to it. 

 you think Jack saying "the farther you move away from nature, the more you suffer" meant not nature-nature but /man's nature/? 

 If he was talking about returning to the 'state of nature', he wouldn't have written that in Nostr... So he obvious meant what I said before.