After the US killed the Iranian leadership, Iran split into 31 tiny countries.

These tiny countries got orders from the dead leadership to keep firing until the Americans go away.

If things get worse, their orders are to keep firing bigger missiles.

If things get even worse, like the electrical grid goes out, you keep fighting and take out the surrounding countries with you.

There is no surrender from Iran, and the US has also said they will not surrender.

This is pretty much a death match until the end.