What makes you think the Iranian regime is trustworthy to actually respect that deal and not just continue building nukes on the side while using diplomacy to string everyone along that they aren't?
You know who else had a deal? Ukraine. Did that deal stop them from being attacked by Russia? Can you stop a military invasion by waving the piece of paper with the deal in the enemy's face? Because that's why nukes are the best insurance policy over deals and why Iran desperately wants them.
How can people be so gullible to blindly trust Iran's word thinking a deal means anything?