Because the ethnic cleansing of Poles as a cleansing mostly happened in Ukraine and Belarus?
Are you taking the piss right now.
A million Poles are deported from Poland itself, some 150,000+ are outright executed, and you’re saying that the Soviets were performing these atrocities on a larger scale in Ukraine and Belarus, when there weren’t even a million Poles in the whole of the USSR.
Are you fucking stupid.
https://en.m.wikipedia.org/wiki/Population_exchange_between_Poland_and_Soviet_Ukraine
From your own source
The population exchange between Poland and Soviet Ukraine at the end of World War II was based on a treaty signed on 9 September 1944
1944
Couldn’t do it in 1941, now could they?
Don’t forget the part where America and Britain agreed.