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Honest question - have you ever worked somewhere where people above you in the food chain have made decisions you consider bad or unacceptable?

If not, it may not be clear that those above you are ultimately going to win any disagreement. If you can't change their mind, there really isn't anything you can do, except limit any damage to your repuation for your next role (ie, leave before the s*it hits the fan).

The other effect, explained so well in the short book "The Power of the Powerless", is that the idea of using your increasing clout and power as you rise through an organisation to make changes for the better is largely a fallacy. Paradoxically, the higher up you go, the less freedom you have to use that clout and power.