If you’re looking for a master stroke that leaves no collateral damage and nothing left to do afterward, you’ll never take any action ever.
Saddam was a butcher and we hanged him. The Iranians are butchers and we’ve taken up positions on all four sides of them. If push comes to shove we at least have the bases we need.
If they soon have nukes, they soon would have had nukes had we not hanged Saddam. And if we decide to do something about them, we’re in better shape to do it than we would have been otherwise. And if we decide not to do anything about them, then whats the complaint?
Saddam was convicted by the Iraqis he'd tortured and murdered. THEY hanged him.