I, too, had read a number of articles about who will benefit from the withdrawal from JCPOA. I think Trump's primary interest in scuttling it was purely spite. Anything Obama did, he viscerally opposes. It was one of Obama's signature achievements, therefore it must be bad. He's not a deep or strategic thinker.
But, there are certainly those who gain from Iran as the boogeyman, and they encouraged the weak-minded one to "take a stand". Among those are: John Bolton (whose neocon bona fides need stimulation); Israeli hardliners (Netanyahu); Iranian hardliners; Saudi Arabia; Russia; China. In other words, all those who are not fans of American security. Trump was quite willing to play into their hands. He's a fool of the highest order.
A well reasoned argument is like a diamond: impervious to corruption and crystal clear - and infinitely rarer.
Here, as elsewhere, people are outraged at what feels like a rigged game -- an economy that won't respond, a democracy that won't listen, and a financial sector that holds all the cards. - Robert Reich