We can learn much, seeing what is happening, and then we can think introspectively about other civilizations which have disappeared, either through war or through calamities which apparently look natural.
Why have human beings gone through this struggle since the very beginning? Were there not already highly developed civilizations living on this earth? And yet their consciousness got lost and man had to start all over again.
There are stories about cultures reaching to the peak. But those that reached the ultimate height eventually had to go underground.