Trump can’t back down. He has no other method of operation than application of further force to make his opponent yield.

You will do what I want, you’re making me do this. This is your fault I have to hurt you more. Anything you do in retaliation is your fault and not a justifiable reaction to what I’m doing to you and I will hurt you harder for everything you do to defend yourself.

He’s an abuser.

If he were to stop, that would mean losing face and the possibility be were wrong.

No narcissist can do that.

Sure he can, narcissists do it all the time. Wallstreet even coined the term “TACO” because he does it so often.

All he has to do is declare victory and move on to something else.

The problem this time is that he has already declared victory and tried to move on but the straights are still closed. He can’t think beyond his next meal.
He has declared victory already, but problem is that Iran was little bit more than he could chew, and they are not going to back down. Only thing Trump can do is try to hit harder and that would not end until he uses nuclear weapons. And I’m sure that is the path he is willing to go.
Maybe, but in this case the country whose intelligence agency ran the child pimp from whom Trump got his young girls is the country that would have to fight on alone if the US declared victory and left. Even if you put that bit of leverage aside, there’s massive bipartisan support for Israel in congress and across the US ruling class in general. Thus, they’re stuck. Iran has grabbed israel by the belt and is punching it in the face.