The immigration raid at a South Korean-owned electric battery plant in Georgia last month shocked the world with its overreach. At a time when the Trump administration is trying to re-industrialize America, why humiliate hundreds of business travelers? As the injured party, Seoul ought to capitalize on the widespread public outcry to strike the best trade deal it can with Washington.

In the aftermath of the Sept. 4 crackdown on the jointly owned Hyundai Motor and LG Energy Solution factory outside Savannah ¡ª the biggest-ever Homeland Security enforcement action at a single location ¡ª U.S. officials sought to justify the operation by saying the 300 South Koreans arrested were working illegally. But that logic now appears to be on shaky ground.

U.S. Deputy Secretary of State Christopher Landau expressed ¡°deep regret¡± about the case during a visit to Seoul following the return of the detainees. And last week, an inaugural meeting in Washington between the two sides to thrash out a solution on working visas ended up affirming that South Koreans on short-term permits had every right to be doing the kind of work they were brought in to do. The U.S. agreed that visitors bearing the B-1 visa or arriving with an ESTA visa waiver are permitted to install, service and repair imported equipment related to investment projects.

No immediate progress was made on Seoul¡¯s efforts to establish a more formal visa category for temporary employees, which workers in Australia and Singapore enjoy. That would require Congressional approval. Still, the assurances were enough to enable LGES, the primary operator of the facility, to resume sending specialist workers to Georgia after the autumn harvest holiday this week.

As I¡¯ve written before, there is no doubt Korea Inc. is eager to move on from the unpleasantries and return to business as usual in its biggest and most profitable market, where tens of billions of dollars in investment have already been committed. But that doesn¡¯t mean it should.

It¡¯s precisely because of the primacy of the U.S. that Asian economies such as South Korea, Japan and Taiwan should make a stand now and draw a proverbial line in the sand regarding how they engage with Washington on trade.

For example, during Hyundai¡¯s first ever U.S. investor conference in New York, held just days following the ICE raid, the carmaker touted North America as its ¡°powerhouse¡± of growth. It plans to double U.S. vehicle production from the current 40% of domestic sales to 80% by 2030 in response to U.S. President Donald Trump¡¯s tariff policies. But without a finalized trade agreement, Hyundai and fellow Korean firms are being hammered by 25% import tariffs, compared to 15% for their Japanese and...