And yet none of those explications were cited by Trump. They would seem like obvious rhetorical wins for populist support of the fight against terrorism. A more honest explanation would have to ask what the US government stands to gain from renewed sanctions of Iran.

https://en.wikipedia.org/wiki/United_States_withdrawal_from_...

Nope. There have been multiple reports that validate the claim that the deal was terminated by a combination of Trump's personal distate for a deal negotiated by his predecessor and a proliferation of Iran hawks in the Trump Administration.