They may seem amoral, but barring the rare cases like Donald Trump, they are generally not. They are amenable to being shamed and subject to social sanctions. Hypocrisy is a charge that can stick better.
This only means they are not jerks to
American citizens whose ballot they fear. Too bad for you if you happen to be Yemeni, Palestinian, Libyan, Venezuelan, Iranian, Iraqi, Syrian . . . etc etc. See how much you can 'shame' them into remembering your humanity then.
Hence . . . amoral sticks very well. This is why hypocrisy comes easy to them. It's because those principles are easy to pick up and throw away according to how they serve or hinder the interests of power and money.
About intervening to stop genocides: The ONE unambiguous case of Genocide since WWII, Rwanda, saw them refusing to touch with a 1,000-foot pole. This was not Trump, it was Clinton. Almost every time
they scream genocide, it's for some manipulative reason, and typically, things tuirn out far more nuanced than they claim. What can stop genocides is a security system to which all are subject, which
they will not let happen. They even threaten to invade Netherlands if an American is tried there.