[enraged_camel]

>>It is in everyone's, and especially upper management's, best interest that the company does well.

I think you're attributing a level of rationality and benevolence to upper management that doesn't always (or even often) exist.

It may very well be that the reason they aren't hiring more people is because they want to increase the money that goes into their own pockets. Or maybe they themselves have burned out and become bitter about "disloyal" employees who keep quitting and they don't have any energy left to do something about it.