Sure. But less so than 9/11 and Hiroshima because its targets weren't civilians.
Actually the Japanese strafed civilian targets that happened across their path, 68 civilians were killed during the attack and the Japanese had to go out of their way to kill them.
Yet they weren't the primary target and 68 isn't quite 3,000 or 200,000.
Which is true, however as evidenced by the Japanese murder of 300,000 civilians in Nanking in 1937 they certainly felt that civilians were fair game. The Japanese soldiers simply brutal extermination of the Chinese army POWs where they burned them alive, conducted bayonet practice upon them, mowed them down with machine guns and beheaded them while conducting sword practice, all well documented by the Japanese mind you so there is no doubt that it occured, goes a long way towards explaining why Japanese casualties weren't the major consideration for our leaders. And yes this was all known back then.