In diplomatic endeavors what is important is to remember the big picture. What was the result of Germany's invasion gain for Germany? The end result was the almost total destruction of the nation. In diplomacy many times we have to set the priorities in proportion so that the long term goals can reasonably be met. In this case Hitler made a huge mistake.
In any event the National Socialist policy was a contradiction to what the Catholic Church teaches.
Big picture? The saving of German lives was and should have been the big picture. What was Poland's responsibility in this? They did not trigger the war by their own actions?
Again, would you apply your same line of reasoning to the Holy Crusades? Christians were being slaughtered by Muslims and their lands being taken.
If you had bothered to read any of the evidence, Poland wanted to invade Germany and felt comfortable that they could engage in their crimes and still have France and England watching their backs. Beautifully, Poland got hung out to dry by France and England and got their asses handed to them for their treachery. Serves them right.
Why do you think there were so many Germans being murdered in "Poland" at time? Hint: these lands were illegally taken from Germany at Versailles. East Prussia was theirs, not Poland's. Poland connived with the Allies to land grab from the Germans and had blood on their hands. You would sit here and tell us about what is "proportional" when the Allies, Poland included, were conspiring to once again cut Germany down and then tell us that it was Hitler's fault for acting as he should have?
You are outside your mind and are trying to protect an false image that is exists only in your imagination and many other mindless sheep out there.