I can't argue with anything that you are saying and am grateful this post is up to stimulate thought but there are MAJOR factors that you have left out of the equation that are VERY influential on market crashes.
The truth is the the bankers own and control the monitory system around the world. The global elite run and control the banks/bankers. If you do your research you will find thousands of years of history that prove markets rise and fall according to PLANNED orchestrated events set up and influenced by the global elite.
I published an article titled "The truth about money" of which goes into the history and factual realities around "money" of which is also revealed to not be money at all but a "fiat currency".
So really until this is comprehended and something done about it other factors are quite insignificant.
https://steemit.com/money/@quinneaker/the-truth-about-money-what-you-need-to-know-to-free-your-self-from-perpetual-debt