A couple of things have come up that I want to weigh in on, as far as the US' stance here goes and historical comparisons.
The world is full of people who will gleefully exploit sloppy, half-understood historical analogies in order to justify whatever BS soapbox they feel like getting up on at the moment. The Roman Empire is the classic example. EVERY major western world power since the fifth century has preened itself as the supposed heir of Rome, and every one has fretted over comparing its alleged problems to whatever supposedly brought Rome down. The whole exercise is nonsense. It only works if you over-generalize to the point of making comparisons meaningless.
Secondly, realpolitik. Politics are and always have been about power. That is not an immoral aberration, that is the definition of what politics is. The entire substance of "democracy" is not to make a country where the people in power are a bunch of saints. The substance of democracy is to create a system where they have some accountability to the people they govern. In international relations, the first responsibility of any government is not and never has been any high-flown ideals of democracy and justice for all, it is to prevent its own people becoming the victims of others' aggression, either by maintaining peace or by forming alliances that will assure success if a conflict does arise. That often means working with nasty characters who have convergent interests, including the likes of Mubarak.
What's rather extraordinary in the US' case is not its willingness to work with these characters, but the willingness even to entertain the idea that our foreign policy should pursue higher aims of justice and human rights as well. There's no point putting the cart before the horse here.
Finally, the comments about "freedom" and its alleged absence in the US. I would dearly like to know what golden age people have in mind when Americans (or anyone else) were more free than they are today. Or is this about some abstract fantasy of "freedom" that has never actually existed?