At some point, the bluster is insufficient and the reality of taking responsibility for decisions that cannot be blamed on someone else takes hold ... Trump was sheltered his entire childhood, and he has ducked responsibility his entire adult life; I'd suggest he is almost incapable of taking responsibility for anything.
Yet another shooting war in Southwest Asia is, undeniably, going to be a failure for the United States; even if a US air campaign was "successful" in destroying significant Iranian military infrastructure, that is not going to lead to significant changes in the Iranian government's policies regarding the rest of the region, and the aftermath simply would encourage further asymmetric conflict on the behalf of the Iranian government.
Although Trump "might" gain a short-term increase in domestic support in the US, it would largely be from a marginal element of his already marginal base - establishment Republicans, for lack of a better term - and might actually diminish his support among isolationist Republicans. Independents and Democrats are unlikely to move toward supporting him, and if anything, such a failed conflict would drive independents further from Trump.
So there's no 'win" for Trump, other than in very short term and from a very small percentage of the electorate.
Ultimately, Trump understands the job is more than he bargained for; one of the very few "human" experiences he has had that got some coverage was his first - and only, if I remember correctly - visit to Dover AFB when the coffins of US military personnel KIA overseas came home; circumstances were such that he had to actually look a grieving family in the eyes and there was nothing "good" in the exchange for him.
Trump can't face the reality of actually being responsible for something; he can't stand the risk, and he has never had the moral, mental, or even physical capability to endure any sort of uncomfortable situation.
Now, we'll see over the next few days whether I'm correct, but the point about Venezuela is a good example; cheap and easy victories are the only ones he has the stomach for, and there would be nothing cheap or easy about a conflict with Iran.
As a far better man than Trump once said: "Victory has a thousand fathers; defeat is an orphan."
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