It's a shame we got rid of the deal that brought their domestic uranium production to a halt [0]. Trump fucked this all up so badly.
[0] https://www.statista.com/chart/23528/irans-stockpile-of--low...
[0] https://www.statista.com/chart/23528/irans-stockpile-of--low...
But Iran also contains reformers, and the deal was a bet that if you do good diplomacy you can reduce the power and influence of the shit-stirrers.
https://en.wikipedia.org/wiki/Joint_Comprehensive_Plan_of_Ac...
The relief of sanctions enabled Iran to fund their other activities in Iraq, Lebanon and Yemen. It also enable the regime to invest in other weapons programs including weapons Iran has been supplying to Russia and those it and its proxies are launching against Israel.
I'm not sure Trump withdrawal from that deal was the best idea but the deal wasn't great either.
"The thing that prevented them from achieving a nuclear weapon didn't also prevent them from funding x y z other far less problematic things that can be far more easily handled through conventional diplomacy and military action"
Seriously?
The core issue to the most of the world is nuclear proliferation, not low level terrorism and militia groups.