That said I think it’s a bit suspicious when so much of the ownership is institutional investors who seem to just own each other, and appear to work against the very interest of maintaining and growing the value of the investment, which is what one would think being a shareholder is all about.
Because they're getting out long before the stock craters.
Shareholders do not care about companies. They care about making money.
The original sin is paying executives with stocks and especially stock options. It creates catastrophic and corrupting incentive structure.
Their incentive is to raise the stock price long enough to sell some amount of stock options. The company be damned.
There are many examples, but the classic one is Dick Fuld, the CEO of Lehman Brothers. He drove Lehman Brothers into Bankruptcy all while becoming dynastically rich.