Uh, Israel and USA are already bombing core infra in Iran. Iran is retaliating against Israel as your point 2 states, and against the Gulf countries on their critical monetary assets - because that's where it hurts either party. Targeting civilian infra in Israel means Israel's image of infallibility is shattered, while targeting monetary assets in Gulf countries (like gas fields, refineries, financial districts, etc) means that they're intent on applying pressure to the Gulf countries. They can't do the former to the latter because of the extremely large (90%+) expat populations, and they can't do the latter to the former because Israel's sensitive assets were presumably prepared for the long fight, so are likely to be heavily guarded.