Build greater trust? The Iranian regime's identity is based on anti-American rhetoric. They fund Hamas and Hezbollah because Israel is an American ally. They say this in their marches and their speeches and their rallies.

You are suggesting that these people change their entire identity to suit your notion that the world should be peaceful. Would you suggest that a metalhead not wear leather because you don't like loud music? Would you suggest that a gay man "be normal" because "God doesn't like gays"? Identity is not something you change in other people. Unless you're some colonial conquerer forcing your culture on others.