They did, especially against Jews.
Everytime a village or a town was taken by polish forces, a pogrom happened. It was pretty much well known by then, as a few members of the parliament blamed the army for these pogroms.
Now, the soviets weren't really nice either, and I'm completely willing to admit that they did terrible things. But so did Poland.
And the way PoW died was quite similar on both sides: many died from malnutrition and diseases, some were shot on the spot. Neither state had the means, the will and the resources to take care of ten of thousands of PoWs, so they just parked them into WWI-camps and let them rot there (or used them as a workforce). Soviets did it. Polish did it. Been there done that.
This whole "we were bad, but they were slightly worse, so it's all their fault" argument is childish.
The only reason why Poland might have the moral high ground is because Polish newspapers and democrats actually criticized the way the war was handled. They criticized the way soviet PoWs were (mis)treated, they criticized the violence against civilians and jews. They criticized the occupation of western ukrainia.
Of course, nothing like that happened in USSR as it was by 1921 already a full working totalitarian dictatorship.
Now, I'm not sure you've noticed so far, but people here don't really give a damn about your topics and constant rants. We're perfectly willing to discuss Poland's history with normal people, but blind nationalists aren't really fun or interesting to talk to. If you were at least willing to admit that Poland has done some wrongs at some point, that would be somewhat of a relief for us.
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