Yeah, anxiety is a natural response. And we've developed biological mechanisms to adapt to it. But the application of anxiety has changed _so much_ in just the last few centuries. Anxiety sources have proliferated. Beyond food and shelter, we have anxieties about grades, waking up early, approval from peers, et cetera. This compounds, especially if you come from a family that struggles to even provide food and shelter. Children are also then told they live in a meritocracy and therefore should internalize their shortcomings and bad marks.
I digress, but I don't think we can appeal to nature and argue our current situation as natural. We can be doing better.
Based on what _I think_ you're trying to say, I think this is a terrible take and I hate everything about it. People aren't trees. Society, people, and children especially shouldn't be forced to be exposed to anxiety inducing, depressing, and stress inducing situations. (But that's what I'm guessing what you're saying, since you have not put a real conclusion or clear statement there.)