I thought the same thing...but it is such a locked country.
There are Shiites in Iraq who follow Grand Ayatollah Sistani that could help move weapons for defense to Iranians. Sistani certainly does not agree with the Iranian regime.
Ayatollah Sistani preaches that Muslims should be guided from the mosque, not ruled by force of rule of the government. His followers, both in Iraq and Iran, surely deplore what they see in Iran now.
If our country were to assist them, wouldn’t those Iraqis help arm the Iranians, who suffer tyranny far worse than Americans suffered under the British, and who rose up to fight for freedom?