My point is that we should have taken "their" money and used it against them. This is how you deal with enemies.

That's naive and simplistic. Your counterparty isn't going to agree to a deal if they get nothing in return. "Stop doing nuclear stuff or else" isn't a deal, it's a demand.

And this fiasco proves that the US can't really do enough militarily if Iran just decides they don't want to abide by a deal/demand. Sure, this war was costly and painful for Iran, but they're coming out of it with better terms than they had before the war.