First- there is always something you can do.
Second- The Iranian government is approaching this wrong. They're all bluster and sabre-rattling, when they should have approached it intellectually and laid out their case for why they should be allowed to have a limited nuclear arsenal.
I am very concerned with Israel being the only nuclear-armed state in the region and Israel now having economic ties to its former enemies which ensure peace. Iran is their only opponent, so the balance of power is uneven.
Being a student of history, I find myself a major proponent of balance of power.