Having found yourself in a war...

It would be better to ask about the murder of civilians by their grandfathers. If they say that the infantry was forced to shoot at the civilian population, then I won't argue anymore.

I can't do that anymore, and they didn't fight.

Added 3 minutes ago
As for the Soviet Union, I really don't know of any cases where soldiers of the Red Army were ordered to act against the civilian population, but if they were ordered to, they would have done it.

Added 3 minutes ago
At least they raped German women a lot...

Added 38 seconds ago
and without any order...