There wasn’t much sniveling over the bleeding out of Japanese soldiers by US and allied warfighters by the time of the Battle of the Bismarck Sea. Guadalcanal had been in progress for some time as had the New Guinea fight, including the epic ANZAC defensive action along the Kokoda Track.

The absolute barbaric brutality of the Japanese was well known by this time and there was very nearly zero hesitation to do unto them what they’d been doing for so long to so many for so long.

The Japanese killed in the Battle of the Bismark Sea were being sent to reinforce their offensive to take New Guinea. The allied forces were barely able to hold on as it was. If the Japanese had succeeded, there’s every likelihood that the ANZAC nations would have been cut off, isolated and eventually invested by Japanese forces.

I seriously doubt there was any pilot that shed even a single tear of remorse for those Japanese that got fed to the sharks.