Uhh... except that "Life, liberty, and the pursuit of happiness" isn't in the Constitution either. Way to go.

Because it's imposed by an authority acting with certain interests in mind, rather than reflecting the overall trends, preferences, and interests of the culture as a whole?

You've never been stalked, have you?

The difference is that you have a choice of whether or not to give your money to a private institution. You don't like the policy, don't go to that particular amusement park. Then their policy can't touch you.