Why on earth would anyone trust a country that reneged on a hard fought deal and followed that up by bombing during negotiations to restore what was lost.
Like what's the worst case scenario that happens to iran if they just signed a new deal? How would it have been any worse than the current situation?
The deal doesn't even require a high level of trust - worst case they just go back to the previous situation. Making a deal only has an upside, even without trust.
Just like employment at will - and yet having a job is better than no job in most cases.
Is it really just for a return to the pre-Trump status quo, only this time with the same deal not cosigned by Obama?
There's zero foundation for trust to uphold an international agreement even between US and its closest allies. Iran has no basis to believe any agreement will be legitimate or upheld.
If you believe the US military, Iran has already lost the majority of its capital-intensive armaments and its nuclear program and its senior leadership. This means there are fewer strategic holdings now at risk. Iran knows it can't be effectively invaded. The regime loses control in two scenarios: (1) internal regime change; (2) diplomatic capitulation to US demands. Waiting out at least US mid-terms while continuing to threaten the strait and neighbor's infrastructure is quite possibly Iran's best decision tree path from the point of view of the regime.
I am of course not certain why Iran's armament is of any concern to America. It might be of concern to another country of course, which loves to make America fight its wars.