“The youth groups that were instrumental in forming the ŻOB had anticipated German intentions to annihilate Warsaw Jewry and began to shift from an educational and cultural focus to self-defense and eventual armed struggle.[4]
Unlike the older generation, the youth groups took these reports seriously and had no illusions about the true intentions of the Germans. A document published three months before the start of the deportations by Hashomer Hatzair declared: “We know that Hitler’s system of murder, slaughter and robbery leads steadily to a dead end and the destruction of the Jews.”[5]
A number of the left Zionist youth groups, such as Hashomer Hatzair and Dror, proposed the creation of a self-defense organization at a meeting of Warsaw Jewish leaders in March 1942. The proposal was rejected by the Jewish Labour Bund who believed that a fighting organization would fail without the help of the Polish resistance. Others rejected the notion of armed insurgency saying that there was no evidence of a threat of deportation. Moreover, they argued any armed resistance would provoke the Germans to retaliate against the whole Jewish community.[6][7]”
by Wikipedia.org