The survivors of the firestorms caused by the Allied firebombing campaign undoubtedly did the same and there were an order of magnitude more of them, since firebombing was used to level most of Japan's cities in the final phase of the war.

Take care not to fall for over-dramatization by people with an agenda. While the atomic bomb is a fearsome weapon, in that specific regard, its effects were not special.

EDIT: A 2015 Japan Times article expresses it well:

"...On March 10, 1945, U.S. B-29 bombers flew over Tokyo in the dead of night, dumping massive payloads of cluster bombs equipped with a then-recent invention: napalm. A fifth of Tokyo was left a vast smoldering expanse of charred bodies and rubble.

Today, a modest floral monument in a downtown park honors the spirits of the 105,400 confirmed dead, many interred in common graves.

It was the deadliest conventional air raid ever, worse than Nagasaki and on a par with Hiroshima. But the attack, and similar ones that followed in more than 60 other Japanese cities, have received little attention, eclipsed by the atomic bombings and Japan’s postwar rush to rebuild..."

https://www.japantimes.co.jp/news/2015/03/10/national/deadly...

(And if you find yourself recoiling at the brutality visited upon the Japanese, bear in mind the combined death toll from the Japanese occupations across Asia are nearly triple of even that of the German Holocaust. While nobody's hands were clean in WW2, some hands were much, much dirtier than others.)