>why are we morally bound to adhere to their model of political authority?
We're not, the Constitution can be changed, the government can be replaced, you can go somewhere where government works differently.
The philosophical ideas behind some of the "unfairness" of the Constitution were good ideas and have led to a lot of higher-level fairness which people tend not to appreciate.
We're also just the longest surviving government in the world besides some very small exceptions, so apparently quite a few things worked.
We're not, the Constitution can be changed, the government can be replaced, you can go somewhere where government works differently.
The philosophical ideas behind some of the "unfairness" of the Constitution were good ideas and have led to a lot of higher-level fairness which people tend not to appreciate.
We're also just the longest surviving government in the world besides some very small exceptions, so apparently quite a few things worked.