Yes, the former Nazi allies that the Allies gleefully partnered with as soon as the opportunity presented itself. Of course that was just a one time thing and the West would never again ally itself it forces that openly call themselves Nazis. Oh wait, the West is currently doing that today. Relative moralism is something the West specializes in doing.

Just to clarify further, we are talking about the Katyn massacre Soviet Union?

There was no glee, it was simply a partnership of convenience to defeat the much worse enemy. The west didn't starve and murder their own people to the tune of 10 million+ like the Soviets did, outside of the losses in fighting the Nazis

They starved about 10 million and they murdered another 10 million:

https://en.m.wikipedia.org/wiki/World_War_II_casualties_of_t...

Their total losses were about 26.6M. For comparison, German concentration camps killed about 6M, but Russia was on our side, so we don’t like to compare these two numbers.