A government may have entirely benign reasons for creating a comprehensive population database, but you cannot guarantee who will control that database later. You have to trust the people who control it, not only now, but at all times in the future, but history does not support that.
Nazi Germany and occupied forces used census data, municipal population registers, etc., to identify and track down targeted people. The United States, during World War II, used census information to assist in the removal and incarceration of citizens with Japanese, Italian, and German heritage. The Rwanda population database explicitly classified people as Hutu, Tutsi, or Twa. This became the mechanism to target Tutsi during the Rwandan genocide. In China today, these databases are used to surveil and imprison Uyghurs.
A government may have entirely benign reasons for creating a comprehensive population database, but you cannot guarantee who will control that database later. You have to trust the people who control it, not only now, but at all times in the future, but history does not support that.
Nazi Germany and occupied forces used census data, municipal population registers, etc., to identify and track down targeted people. The United States, during World War II, used census information to assist in the removal and incarceration of citizens with Japanese, Italian, and German heritage. The Rwanda population database explicitly classified people as Hutu, Tutsi, or Twa. This became the mechanism to target Tutsi during the Rwandan genocide. In China today, these databases are used to surveil and imprison Uyghurs.