The difference between the red army behavior and the US army was that in the redarmy mass rape was defacto sanctioned as a retaliation punishment. The first two days of conquering a town the redarmy wouldnt deploy commisars to halt atrocities and in Berlin it took months.
Obviously the USA would commit mass atrocities in Japan, and later Vietnam and a whole lot of different places but there was a distinct difference in conduct in Europe influenced by how the respective nations viewed the war and the enemy.
Not much different actually on how the French after worlwar 1 set out to completely humiliate the Germans which the english and Americans objected too.
The fact that these nations obviously never faced the same behavior from the Germans on their soil is obviously a big part in that.
But yeah, playing the "but x did it too" card is bullshit and disgusting.
The mind is its own place, and in itself Can make a Heaven of Hell, a Hell of Heaven. What matter where, if I be still the same, And what I should be, all but less than he Whom thunder hath made greater?
Here at least We shall be free