To be fair, by 1943 there was nowhere to flee. They should have listened to Jabotinsky in 1938, when there were still a few places that were letting Jews in.
The Satmar Rebbe or the Belzer Rebbe , who were in Hungary in 1944, could have told their flee resist going into the ghettos and resist going into the trains. The Gedolim today are telling their flock to totally resist going into the army, why didnt they do this in 1944. If the Nazi had to drag every jew into the train they would have been greatly slowed down. The Nazis were short Ammo, they could not shoot every jew. They needed the jews to comply with order