U.S. President Donald Trump has said that his campaign of “maximum pressure” on Iran isn’t aimed at precipitating regime change there. That hasn’t stopped him and his aides from telegraphing their hopes for it. So it was when protests erupted in Iran over news that government forces had mistakenly shot down a passenger jet, killing the 176 people on board. The demonstrations tapped into a vein of popular frustration with Iran’s rulers that fed earlier protests in November. Taken together, the un