There is a previous answer by /u/commiespaceinvader which addresses this. An excerpt:

They knew that when Nazi officials requested lists of who was to be deported, this meant that people were sent to their deaths in many a case. At the same time, a refusal to cooperate could mean the entire Ghetto was killed outright. Rather than the wish to protect themselves or fellow officials within the Jewish administration, one of the prime motives of basically all the Jewish councils was to try to save as many people in their Ghetto as was possible.