[ I am puzzled as why the Jews don’t talk about the horrible holocaust by the Russians. ]
Many Jews died in the Holodomor, but the Russians were equal opportunity democide-ers as long as you were a Kulak you starved or were shot trying to feed you starving family.
As to why they don't talk about it -- I would say they DID talk about it before 1914. In fact in 1914, in Germany and in what would become Israel, Jews were pro-German against the Russians because the Kaiser's Germany gave them a lot of ability to grow and practices - if they assimilated as many did (read "Hanns and Rudolf"). In 1914 to a Jew it was clear - the Germans were civilized and would protect them from the Russians. It is incredible how attitudes changed in a few short years (with reason).
Anyway, so "fiddler on the roof" and various actions against the Tsarist regime happened. But the Tsarist regime was very good at keeping dissidents down (the Nutters learnt from them)
but remember that socialism promised a new beginning - where there was no discrimination against Jews. And to an oppressed people it seemed ideal. So many Jews were enamoured by it and fell for its false teachings (just as many non-Jews fell for it) - also add to the fact that the Soviets were our allies in WWII so to admit they were evil is to call into account our very belief system (to dance with the devil....)
Anyway, I digress, so that's why Israel and American Jews may not talk about Russia's past pogroms. Also the fact is that Putin and Netanyahu get along, so geopolitics may also come to play.
My own, unscientific, opinion is that Poles and Jews lived alongside each other for so long (1000 years) as friends, neighbors and they fought alongside each other many a time - so a fratricidal hatred, which can be the worse kind.