Once a company is traded publicly, the market, over a long time horizon [1], usually gives a good value estimate to the company. In the short-run you have to contend with the different ways to juke the price, such as share buybacks just before the CEO is to get a bonus etc. Heck, even in Boeing's case, the market corrected for the stock price (especially if you consider inflation) once planes started falling out of the sky, and the company started to change. Now only doors are falling out of the sky! It's still a price we shouldn't be willing to pay for a market correction - and that's where efficient regulation comes into play, itself a very fraught tool to get right. All in all, we suck at forecasting, understanding, and learning from outlier events. Maybe it's an inherent problem.

[1] with the usual caveat that the market can remain irrational longer than the plane can remain airborne