The soviets killed their own people and didn't follow POW laws at all. Probably killed more of their own than the nazis did all-in-all.
In same reality where Stalin himself executed 7 million Russian cowards who refused to attack enemy lines with their bare hands per day. All with his legendary 7 round per cylinder Nagant revolver. Go read a book (and by book i mean something with basis of proven facts) before posting such outstanding nonsense.
The US dropped a nuke on civilians twice.
First USA nukes were far less powerful then regular carpet bombings, which turned entire German cities into dust. Pro tip: crushing defeat of elite and most powerful Kwantung Army by Soviets was far more essential to Japaneese capitulation than nuclear bombing, which wasn't recognized as nuclear bombing at first anyway.
War is war and full of dirt no matter what, there is no clean sides. But, if you decided to dig in all this dirt, and even more — point on others dirt, make sure you have less dirt on your hands (or on hands of side which you defending) firs. Your example of evil Russkies who didn't follow POW laws (just to let you know: in bad shortage of supplies, primary food, starving Russians, including civilians still feed Germans prisoners) is nothing in shadow of crimes of SS fanatics, which alone justify banning of Nazi flag forever.