Views among South Koreans and Japanese about each other's countries have worsened over the last year, a recent survey shows. Could some of that be down to unbalanced or inflammatory media coverage?

The poll shows that the deterioration in sentiment can be largely traced to long-running feuds over how Japan has atoned for its wartime past--issues that have been reheated under the current leaders of each country. But the poll also indicates that Koreans in particular don't think their media gives a fair account of news about...