When I said wisdom was useless during a collapse, I mean wisdom about how to handle riches. Essentially, that's what we have not been able to handle well.
Gold during a collapse goes into hiding because it is either outlawed, or plundered whenever someone tries to use it. Ask the Chinese. During the time of Mao, anyone with any wealth whatsoever was in great danger. The worst thing you could possible have done was to let anyone know that you had any gold by trying to buy something with it. That would either get you a visit from the police, who would make up an infraction and confiscate it for their own use, or robbed, or both. So gold during a collapse cannot be used. It hides, but that is how it safely carries wealth through the time of chaos until stability re-emerges.
For different reasons but along the same lines, wisdom about how to handle riches cannot be used during times of no riches, during times of collapse and re-growth. Unlike gold, which is dangerous to use, wisdom about more complex systems is just not useful when the system is collapsing back to less complexity.
Each civilization apparently has to learn anew the dangers of thinking themselves smarter than causality, smarter than equilibrium, smarter than nature. Rather than understanding that we are an outgrowth of nature, we think that we have beat nature, and turn around and try to tell nature what to do. It is this wisdom that needs to be saved and remembered, to make it through the time of collapse and rebuilding until society once again has resources burning a hole in its pockets.
Not each civilization, but each generation. Hubris is the enemy of wisdom, and humility it's parent.
You clearly were raised right, because much of what you've said is wise.
Hah! Sadly, I think "good decisions come from experience, and experience comes from bad decisions" would be closer to the truth ;-)
That isn't a reflection on my parents though. I just came out of the womb knowing it all and had to get a few concussions to learn the wisdom of humility.