Forget about the $25 billion. That's the estimate the Pentagon has tentatively picked for the direct cost of the Iran conflict, a sum that analysts consider laughably lowballed. The true expense of this U.S.-Israeli war of choice is much higher. It must include not just the global economic and humanitarian fallout, but the strategic opportunity costs of other and more urgent problems not dealt with, and perhaps now made impossible to deal with. One example: North Korea.

U.S. President Donald Trump is defending his war against Iran as a matter of national security and claiming that he prevented the regime in Tehran from developing a nuclear weapon. But according to a column by Bloomberg News' Andreas Kluth, Trump's war is making one of the United States' most danger...