First, taxes still get paid when the individual dies as estate tax. Second, increased shareholder value typically means more corporate profit which is also taxed. Third, dividends are taxed. So your claim that the shareholder value never makes its way into the tax system is plainly false.

This is all aside from the fact that increased shareholder value means a more abundance society regardless of the increase in taxes. We could quibble over the exact distribution of who gains from the enlarged pie but it's certainly not the case the 100% of it goes to capitalists so consumers and employees also benefit.