Iran really does not have a choice. They can not seriously attack Israel. Their missile launchers seem to be destroyed and they hit very little. Air force is not an option either. Hamaz is at war already, Hezbollah has been bombed hard and can hardly fight, much less supplied.

They could bomb some US military installations, but best case they kill some Americans.

Blocking the Persian Golf would fail as well and piss of pretty much the rest of the world.

So ending it is a good option.