system
A chat on subreddit /r/NoStupidQuestions
human
Anxiety, and by extension depression, are essential to survival. 

The people who weren’t always thinking about everything that could kill them were eaten by tigers and bears. The ones who didn’t spend their brain power worrying about the future by stock piling resources all died in the winter and during drought.
gpt
Not to mention that anxiety and depression is *generally* behavioural, not something embedded in our DNA.