I was disputing that financial markets "pin the fortunes of the stock market and potentially the entire economy on the behavior of one person" at least beyond emotional reactions to daily headlines by retail investors.

I agree that markets shouldn't do that, and further, I believe they don't do that in any meaningful way. NVidia's price drop of ~20% is short-term volatility. Tracked against the NASDAQ, NVidia will likely post new all-time highs within the next 100 days.