Your analysis and historical knowledge is correct...but...
There’s one thing that all those mutually antagonistic, feuding ethnic groups all believed and agreed on—IT SURE IS FUN AND PERFECTLY ACCEPTABLE TO KILL JEWS! THE UKRAINIANS ARE ALL FOR THE OLD TRADITION!
Yes, as you point out antisemitism is a cultural thread that runs through all those groups. In some of the groups the thread is thin and under normal circumstances inconsequential. In others it’s near the surface and easily stirred up in a people when a scapegoat is needed to blame the failures of the ruling regime on. A very common tactic in Czarist Russia as well as the USSR - e.g., The Doctor’s Plot. The West of course is not immune, there’s the most famous horrific German example. You see it still, e.g., the growing “Palestinians-Can-Do-No-Wrong-The-Israelis-Can-Do-No-Right!” notion that’s popular with the ‘Nouveau Left’ in Europe & the US. It’s gone on for 1000+ years.