Anecdotally the people I know who grew up in cities have less psychiatric problems then people I knew who grew up in suburbs. They also don’t seem more cynical, just more competent.

Do you have any evidence? Or just a personal hunch?

> big cities are so dangerous nowadays

Big cities nowadays are dramatically safer than they were a few decades ago.

> parents no longer allow their children to play outside unsupervised

This is due to the parents’ paranoid fears, not the inherent danger involved.