This may seem nonsensical, especially since Mr. Trump already shoveled at least $28 billion to farmers hurt by his first trade war in 2018. But it actually makes perfect sense. It’s what happens when Mr. Trump’s zero-sum philosophy of trade — which is that there are always winners and losers, and he should get to choose the winners — collides with Washington’s sycophantic approach to agriculture, which ensures that farmers always win and taxpayers always lose. In the end, Mr. Trump’s allies, including President Javier Milei of Argentina and the politically influential agricultural community, will get paid, and you will pay.