In America, “Barbenheimer” is a success. In Japan, it’s a scandal.

The linking of nuclear holocaust to summer entertainment is backfiring spectacularly here

One nation’s tragedy is another’s merchandise.

Christopher Nolan’s “Oppenheimer” opened in American theaters last month to rave reviews and strong box-office sales. Its success was fueled by an internet meme encouraging moviegoers to watch the dark biopic about the architect of the Manhattan Project in an ad-hoc double-feature with the bubblegum “Barbie,…