Hmm I am unaware of any significant German population living in Eastern Europe prior to aggresive conquests of Teutonic Knights, massacre of polish population in Gdansk in 1308, Prussia's conquest of Poland in XVIII century and following persecution of Polish ethnic group(including laws forbiding usage of polish language, building homes and torture of polish children).I wouldn't call the German Drang nach Osten peacefull, nor would I-looking at history-call it co-existance.It was one ethnic group trying to conquer the other.And that attempt has been stoped in 1945.Perhaps Germans view it otherwise.But in polish eyes-the eyes that see Warsaw Uprising, the eyes that see Battle of Grunwald, the eyes that see Kulturkampf, the eyes that Drzymala's car, the eyes that see polish children being tortured for speaking their language-this is how it looks.The fact that many still see this attempts to destroy my country and nation as something positive disturbs me greatly.A couple of hundred years old history (partly peaceful co-existance, party warlike) of German people living all over in Eastern Europe vanished with this expulsion
Yes I am emotional, but this how i feel as a Pole.
As to the supposed "mass murder" -neither Polish nor Soviet government did make any actions to murder civilians, the death unlike German Reich genocide weren't planned, weren't the subject of any order nor direct actions.Famine, disease took a good share of polish, russian, jewish lives after the WW2 and resulting chaos, including banditry.