Well, before nuking Iran you might want to learn something about Islam. I know, waste of time. But ISIS is a Sunni organization. And the Sunni sect of Islam is headed by, wait for it, Saudi Arabia and its especially virulent version of Wahhabism [there are some mild differences between these two doctrines]. On the OTHER side are the Shia or Shiites lead by Iran. For a millennia there has been strife between Shia and Sunni. So if you want to fight the Sunnis, ISIS, you don't attack Iran which is their fiercest enemy. But you knew that didn't you?

There were no Iranians involved in 9-11, it was almost all Saudis. And Saddam was Sunni, and Al Qaeda is Sunni. So you are attacking the wrong people with your nuke. You've got to hit a Sunni target as almost all attacks against the west have been by Sunni adherents.

The media sources you get your information from have failed in their job of giving you useful, critically useful, knowledge to understand what is happening. Change the channel.

Who will nuke back? Maybe the Russians have a security pact with Iran, their ally. Maybe Pakistan which is a mostly Sunni country and has nuclear weapons. Maybe ISIS which could have a dirty bomb or a biologic weapon. No sane leader would consider using nuclear weapons as a response to Manchester.