Christ knows. It made no sense at all,
If you're finding it difficult to make sense of it all, I can only draw your attention to pp.26-28 of "Rising '44" by Norman Davies (2003 ed.). He promulgates some fairly cogent reasons which make sense to me, and it should put you down the right path. Whilst Mr Davies is not Christ, he does seem to have a good handle on the situation in question.
As to Hitler's demands on Poland who is to say what might or might not have happened if Poland ceded to these demands.
Perhaps Poland may have survived in a fashion to which large emigre movements would not have materialised post WW2, thus obviating the need for you to act as moral inquisitor regarding the metaphysical questions you pose to the descendants of such emigres' vis a vis what they may or may not have done if ordered by their C in C to carry out an attack on Communist Poland...
How did you feel about your Polish relatives as you were taking your oath of allegience to the US commander-in-chief, the President, whilst enlisting in the US airforce and knowing one day your C-in-C might have ordered you to bomb Poland?
Whilst tempting, I'll refrain from asking you the very same question, as it would be disingenuous of me to ask and expect you to reply without feeling trapped, as the answer, by virtue of the question, predicates a negative response that would draw an adverse inference no matter how you answered (it would of course be a hypothetical upon a hypothetical as I'll assume you never joined or served the armed forces of your nation, but correct me if I'm wrong).
It would be prudent to bear in mind that questions of morality, loyalty and conscience must be framed in terms that take account of the context to which the questions relate to, rather than transposing modern day sensibilities, norms and mores to a scenario that happened in the past when of course, such sensibilities, mores and norms were different.
A parable perhaps?
A man stands facing a choice: 2 armed men with guns, who are pointing same at his parents' heads, have asked him to choose - who is to perish, his mum, or his dad?
How does one answer that?
Feel free to have a shot, but if you feel trapped, perhaps you ought to show some restraint in future when thinking about posing such questions to forum members who either have parents who faced such dilemmas, or faced such dilemmas themselves.
And good job too as without Soviet blood-sacrfice on the eastern front the Nazis would not have been defeated. Period.
This proposition presupposes that the Soviets would not have fought the Germans but for 'concessions' and effectively carte blanche from the Allies. It is difficult to reconcile the notion that the Soviet command and/or rank and file simply would have upped stumps and ceased fighting if word was gleaned that the Allies would be scrutinising Soviet actions, or, more relevantly, refraining from quiet acquiescence on the question of Poland's borders and sovereignty. Logic would suggest that the dice was cast at the inception of Operation Barbarossa and that the fight between Germany and Russia would continue until one was annihilated, rather than Russia's continuation of the fight being subject to security of geo-political hegemony and tacit surety from the Allies that such hegemony would not be seriously challenged ex post facto.
Poland's status therefore as sacrificial lamb to the flawed notion of a requirement for a Soviet 'guarantee' of mutually assured destruction of Germany could and should therefore have been avoided.
That said, if you have firm evidence to suggest that the kid glove handling of the USSR was required lest they stop fighting, or worse, turn on the allies, then please share.
If so then we must ask what war crimes Poles may have committed against Germans during WWII also?
Please do. I've heard of one - during the Warsaw Rising a group of SS soldiers were captured by some Polish civilians. The SS men had their skin peeled off and then salted. Their ultimate fate is unknown to me. It was a form of torture prescribed for the SS penchant of:
a. grabbing infants by the legs and smashing them against walls
b. using infants as bayonet practice
c. rolling grenades into basements where civilians were hiding
d. lining families against a wall, shooting all the adults whilst pretending to shoot the children, letting the children absorb the spectacle, and the brains and blood of their parents, then shooting the children
Are these the types of war crimes you refer to? If prosecution for alleged Polish perpetrated war crimes occurred, would we adopt a subjective or objective test of criminality? Do you think these types of 'revenge attacks' ought to be investigated and prosecuted?