How? The Germans had first gone around gathering all weapons. It was a slow process, first weapons, then the Jews were moved to the less desirable sections of town, then they were fenced in, then they were promised that things would be better after they were moved to their new homes and everyone was hereded onto the rail cars. then they were dumped in the concentration camps where they were gassed or worked to death.
Nobody anticipated that the NAZI's were that evil. Murder on that scale was not even considered, so the Jews believed the lies. Unfortunately, so did everyone else.
Some did. Even more would have done were it nor for the fact that others thought that if they were compliant, if they behaved well, then the Germans would not kill them.