Ok but maybe jews simply didnt predict Stalin's rise? Just like they didn't predict the so called national communism in Poland 1968. In My country almost all comunists before and just after the WWII were jews. Even their documents were in jidish language. They supported imposing of communism in Poland, but they were dissapointed soon when simply Poles replaced jews in communistic party. In 1968 thousands of jews were just forced to leave Poland because of the reaction of "national communists". Same could be with Stalin. Anyway, despite later communistic anti semitism, the damages done by Revolution and its benefits for jewish messianic goals remained. Jews were also ready to sacrifice some of them to reach their final messianic aim.