I don't know what's going on. Trump's foreign policy is highly maleable depending on what foreign leader flattered or criticized him in the past 24 hours. But historically he's been averse to committing the U.S. military -- especially boots on the ground military -- to potentially drawn out foreign conflicts. The America First doctrine has its own odd pacifist strain, as in letting other countries kill each other -- not our problem. I'll even tip my hat to Trump for ignoring John Bolton's attempts to escalate reprisals against Iran in the first term.
But for 40 years now the dream of the rightwing think tanks hatching Republican foreign policy has been the overthrow of Tehran and westernization of Iran. Nothing to do with Israel. Preventing any new country from going nuclear always makes sense, Iran more than most. But that's not the main motivator, either. These guys simply believe, not inaccurately, that a US-friendly Iran is the key to Middle East oil, money, and whatever passes for peace.
My guess is that Trump 2.0 is all about the think tank crowd having had 10 years to watch and understand Trump, who now come into his second term with a wish list that they can get our laziest and most easily influenced President to endorse.