The cost did not begin when Trump acted.
It began when the world allowed Iran to believe it could close, tax, regulate, intimidate, or terrorize one of the great arteries of civilization.
The clean moral fact is this:
No regime has the right to hold global commerce hostage.
Iran can govern Iran.
It cannot govern the Strait of Hormuz.
It cannot decide which ships pass, which economies breathe, which countries pay, and which civilians across the world absorb higher prices because Tehran wants leverage.