You can establish things that you think are "very important" in a society, and make it much harder to change than other things.
Of course, if everyone thinks you're the king of France, you're the king of France. But establishing rules to counterbalance the state's monopoly on violence and making those be pretty strong protections within the framework of laws helps establish the norms!
Everything has an asterisk in these kinds of conversation. I think most people can understand the relative difference in values between "people should have a right to assemble and speak their mind" and "people should be able to park on the left side of this street on weekends"