Yes, Japan was brutal, but what they got had nothing to do with infants, it was retribution for Pearl Harbor. The US has a nasty habbit of going to an enemy country and killing 1000-2000 times more civilians than that country has killed in the US.
400.000 in Japan for 2.400 in Pearl Harbor, 200.000 in Iraq for 3000 during 9/11. What did Iran and some other countries do to deserve the rampage that took place is still to be answered...
My stance is that war is wrong and what many countries are doing right now with sanctions is a good way to go. But EVERY war is wrong and hopefully, every country that sends its military to wars abroad will get sanctioned and have their war criminals prosecuted, including the US. I find it non-acceptable that Biden keeps talking about war crimes court for Putin, while the US doesn't even recognize the authority of international war crimes court in Hague which makes impossible to prosecute US citizens for war crimes.