That's cherry-picking. The Iranians said things, Trump said some other things, and your comment chooses to selectively believe some things the Iranians said (that their nuclear program wasn't entirely dismantled, in contradiction to Trump's claims) but not others (that they weren't pursuing nuclear weapons and the late Khamenei considered them immoral). It's now believed Israel was planning to kill Khamenei regardless of any nuclear talks, and forced the hand of the US.

Iran wasn't a threat to the US.