Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
In an idea meritocracy, openness is a responsibility; you not only have the privilege to speak up and "fight for right" but are obliged to do so. This extends especially to principles. Just like everything else, principles need to be questioned and debated. What you're not allowed to do is complain and criticize privately-- either to others or in your own head. If you can't fulfill this obligation, then you must go.
Of course open-mindedly exploring what's true with others is not the same thing as stubbornly insisting that only you are right, even after the decision-making machine has settled an issue and moved on. There will inevitably be cases where you must abide by some policy or decision that you disagree with.