Trump is now caught in the oldest trap of modern warfare – believing a swift, surgical military operation will yield quick, enduring political results. The Soviets did it in Afghanistan; the US in Iraq in 2003; Putin did it in Ukraine, and is still fighting. Whatever force a military fails or succeeds in applying at the start, the people it is attacking have greater commitment to defending their lands and homes.
The White House may have rushed into this, seizing the opportunity for a decapitation strike, provided by Israeli intelligence. Israeli Prime Minister Benjamin Netanyahu has very different objectives regionally, and a long US involvement against Tehran suits his desire for an Iran in rolling collapse that is no longer a threat. But the death of Supreme Leader Ali Khamenei on February 28 has caused as many problems as it has solved.
His ego is his only compass, and he has tied the stock market to his ego. War and Hormuz being closed will hit the stock market. He may well want to back down when that happens, and find himself unable to.