Fighting on the Axis side wasn’t bad; USSR committed genocide, we had interment camps, etc
The engagement in war crimes and in genocide is bad
This person may have engaged in them and that is bad, the same as celebrating a Vietnam vet isn’t bad but celebrating a Vietnam Vet that raped his way through a village is bad
The attempts to make it black and white are a disservice and shows we’ve forgotten the lessons of WW2 where we punished the Nazis but not the Wehrmarcht
And your further comment down seems that you aren’t able to understand this. There isn’t a good side and bad side; there are good people and bad people. The side they are on is largely based on their birth; considering the USSR’s genocide was against Ukrainians they would be more likely to not take that side