What are you trying to argue? That Pearl Harbor wasn't a surprise attack?

That the Japanese didn't employ terrorist tactics against American civilians? https://en.wikipedia.org/wiki/Fire_balloon

> And since when did saying "I hate you, I'm going to war with you" make it OK to indiscriminately kill civilians

Maybe ask the Japanese? https://en.wikipedia.org/wiki/Nanking_Massacre

If you can't understand a strategic decision to bring a war to an end and avoid a larger loss of life, I don't know what to tell you.