It is not immoral, it is amoral. There is no moral in geopolitics and international relations.
The US are not doing anything new. It's just that Trump's style is very "in your face" and that the public have been fed so much BS about "good", "moral", "democracy", etc in international relations that they actually believe it.
It's just as irrelevant as saying that state of individual cells is something you should ignore when establishing diagnostics of a herd.
There's a difference between low pondering and null influence within equations. And if the complexity of the phenomenon exceeds what we can forecast relevantly with equations, then pretending that we know which factor will have significant role all along the development of the situation and which are meaningless is not acting with much sagacity.
It's not a narrative. It's really a statement of fact and very relevant. That's how it works: countries act to further their interests whatever the "moral" might be.
The US, like other countries, have sacrificed tens of thousands of people or more, even entire countries, in pursuit of interests amd broader objectives, for instance.
The US are not doing anything new. It's just that Trump's style is very "in your face" and that the public have been fed so much BS about "good", "moral", "democracy", etc in international relations that they actually believe it.