take any particular company and multiply it by the size of the whole market and you see what we see today: short term thinking across industries, LBOs, big bonuses for executives even in failing companies (toys r us etc)
so, while in any one particular company, yes shareholders wouldn’t put up with that behavior long-term, across the whole market they still get payouts, still have more stable investments that pay dividends etc even if there are those bad actors that wreck companies for thier own will
slightly off-topic, but, for every company that maximizes it’s short-term value, there is usually collateral damage to the people who work there (and thier families), sufferimg low wages, bad conditions, mass layoffs)...that to me is the real issue...
I seriously doubt that subterfuge can be perpetrated successfully quarter after quarter.