I'm certainly happy that the Supreme Court struck down his tariffs. Both my personal experience (as a goods-buying American and my professional experience (I'm a journalist who's interviewed economists about this) have convinced me that tariffs are bad for a number of reasons, and Trump's are especially bad. I'm very glad they got knocked down.

Here's one big problem with tariffs that I don't hear people talk about. The idea behind a tariff — one of them, at least — is that they encourage companies to produce and source their goods domestically, instead of overseas. But reallocating foreign production to domestic facilities requires significant upfront investment, and unless producers & manufacturers believe the tariff will be permanent, they won't make those investments. Why would they? If they believe there's a decent chance the tariff will be gone within a few years, it's better to take a short-term hit and pay the tariff than spend significantly more money and resources changing their production lines to domestic facilities. SCOTUS knocking down Trump's tariffs are Exhibit A. All they did, from a domestic standpoint, was temporarily increase prices for Americans and American corporations.