Avira, your world is so black and white, no shades of gray. The 2 milion+ Eastern European Jews who ignored Daas Torah and emigrated before the 1920’s restrictions survived the Holocaust. Hundreds of thousands more frum Jews who followed Daas Torah in the new Soviet Union were lost as yeshivas and shuls were closec and rabbis,mohelim, community leaders and teachers were murdered. In the Holocaust itself, countless frum Jews were murdered, including Gedolim.
How does this fit into your narrative?
P.S. the Jews of the early middle ages didn’t intermingle but that didnt prevent the Crusader massacres , blood libels and frequent expulsions