I guess they felt they had to be seen to be doing something in retaliation, but they know they cannot compete with the USA. How it proceeds depends on how crazy their leaders are and how much they care about their people. Previously we saw Iraq bomb Israel to try and stir things up in the Gulf War. I feel for the Iranian people who are deprived any normal life. They were doing pretty well a few decades back, but have endured several conflicts since then. Trumps actions are not helping matters.