Doesn't apply here. You seem to think otherwise - why?

I explicitly say that what Germans did is inexcusable.

There is definately a legitamate argument that WW1/2 were essentially the West using the lessons they learned from colonialism on each other. This is pretty explicit in WW2 with Hitler's plan to ethnically cleanse and colonize Eastern Europe. At the same time, the horrible atrocities Belgium committed in the Congo don't make the murder of civilians any more inexcusable.