Hardly all. After occupying the east half of Poland, the Soviets started killing and deporting on a scale entirely comparable to that of the Germans in 'their' half. In both halves (and here are those pesky similarities again) the main hit was against the middle classes - in essence those people who could mobilise opposition - but also the 'enemies of the people': the Jews for the Nazis, the 'capitalists' for the Soviets. Unfortunately in the East the 'capitalists' were often also Jews, so in both areas Jewish losses were disproportionally high.Interestingly enough, all of the Kresy's Jews could have been spared from the Holocaust had Stalin decided to deport all of them en masse to the interior of the Soviet Union between September 1939 and June 1941--though some of them would have likely perished as a result of these deportations.
So, far more 'interestingly', all the Jews of Poland could have been spared the holocaust only if Germany AND the Soviet Union hadn't invaded. Alas they did and the result is the result.
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I will pass by the shear hypocrisy and ludicrousness of this patent bare-faced self-justification because I can't believe that the authors thought this will convince anyone. It does however, perhaps unwittingly, draw another similarity between the Soviet Union and Nazi Germany of the period. Much the same ludicrous self-justification was put forward by Germany for invading Denmark (sorry, I mean protecting Denmark's neutrality from being violated by the British and French in the light of Denmark's military weakness) and all its aggressions from Czechoslovakia onward. This surreal self justification would be marginally more convincing if the Soviet Union hadn't agreed beforehand to dismember Poland jointly with Germany and had not co-operated fully on a campaign of murder and deportation to subjugate their newly conquered territories. Oops, is that another similarity?7 September Moscow looking at in fact collapsed Polish state, taking into account that Eastern part of Polant (up to the Curzon line) was populated mainly by Ukrainians and Belorussians, decided to defends lives and property of local population that could be under imminent threat if Hitler would occupy the whole Poland. Btw, no less than hundreds thousands Jews were saved from the Holocaust disaster thanks to move made by Moscow.
That's the problem with 'selective amnesia' when it comes to manipulating history. It tends to drive you into logically unsupportable positions so grotesque that you end up having to enact laws to shut down discussion altogether.....