Religious flamewar will get you banned here. Please don't post like that to HN.

https://news.ycombinator.com/newsguidelines.html

That’s not my point. My point is that there’s plenty of crappy/failed cultures (tribes in jungles etc.) that allowed public nudity, but not a single successful one did. Maybe there’s something to it.

The psychology of shame and decorum, probably.

How does "shame and decorum" translate to success? Not to mention the fact that most likely all cultures, successful or not, have shame, as it's a direct consequence of having morals (and when you cross them, you feel ashamed).