Iran behaves as though we do not possess the firepower to end the war in a day. The US posseses tactical nukes that can be dialed down to 1/50th the Hiroshima bomb. Iran's war machine is located inside hollowed out mountains in known locations. Enough tactical nukes could destroy the mountain that protects them.

Dropping nukes again would be another giant step toward our dystopian future.

Hopefully we would give warning for people to evacuate the area first...