My vote is somewhere between "mortality" or "fear of our own mortality". I'd like to think the humans to transform into a form of asceticism if the bottom layer

My vote is somewhere between "mortality" or "fear of our own mortality". I'd like to think the humans to transform into a form of asceticism if the bottom layers of Maslow's hierarchy were no longer a daily/hourly issue and we knew absolutely that we had long enough to achieve the top layers of the pyramid. Also: https://en.wikipedia.org/wiki/5_Whys https://en.wikipedia.org/wiki/5_Whys