As long as Saudi Arabia is one of Americas "greatest" allies there is no leg to stand on arguing any aspect of US foreign policy involves a moral war against totalitarianism.
The hypocrisy is clear, but hypocrisy is not sufficient to prove that one does not care at all.
What is pretty clear is that the USA takes a strategic and occasionally very partisan view when making their choices of alliances as well as their use of power and force. I'm not sure they are very unique in this respect though.
Even if they genuinely cared about it, 90 percents of regimes worldwide are dictatorships or authoritarian regimes. So you can not work with anyone if you have very strong principles.
You mean war against radical religious terrorists and dictators that are not allies like Saudi Arabia, Qatar, Jordan and etc?
Countries which support the Al-Nusra front, which was affiliated to Al-Qaeda, which masterminded 9/11 an event which 90% of the terrorists were from Saudi Arabia or other gulf countries and 0 from Afghanistan, Iraq, Syria or Iran.
The concept of righteous crusades has been around forever and it's stunning that it still works.