I certainly agree in general to your post, but not quite on the statement I highlighted in bold
All war parties killed "innocent" civilians during WW2 and any other war on intention - if e.g. a bombing run onto e.g. Tokyo or London or Berlin was undertaken, the mission's goals were to cause destruction upon the opponent and as such also intentionally onto his civilian population - clearly according to the thesis "bombing the opponent into submission".
As such aside from having used 2 atom -bombs instead of conventional explosives, phosphate or air-mines - the purpose/goal was the same - end/win the war.
gipper, Placing blame onto the USA for having killed e.g. Japanese civilians "unnecessarily" fit's the argumentation that it is the Ukrainians that are killing their own population because they are/keeping them amidst their line of defense (cities) towards Russian troops - as such exposing them intentionally towards Russian artillery, rockets, whatever. So why not evacuate all Ukrainian civilians from a threatened city - and thus reducing own civilian cassulties and making it easier for the Russians to win?
So yes, war is hell - and the killing of civilians is intentional on all sides till to this present day. However the ones who propagate that the A-bomb only served the intention of killing innocent civilians and not the purpose of ending a war that had caused 20 million dead civilians already and further to come, are delusional.
Do I as a German blame or accuse e.g. the USA as an intentional civilian killer during WW2 ? yes off course I do - but Nazi Germany had started this war and had done the same thing to others - they just had less numbers of capable bombers and thank God no A-bomb. Same goes for Imperial Japan.