How to help them achieve liberty is a harder problem. The theocratic regime in Tehran has built a fortress of oil wealth, authoritarian allies and domestic brutality. Still, there are promising steps that the United States and other nations can take. President Trump has rightly scolded Iran’s government, but he risks rushing into military action without developing a thoughtful strategy. The crucial question is what measures — diplomatic, economic and potentially military — have the best chance to strengthen the protest movement and sow division among elites allied with the Khamenei government.