This is a good example of why the "I don't have anything to hide" argument is incorrect. That way of thinking only works as long as your goals and positions are aligned with the entity collecting information about you to begin with. If they're not, or the situation changes, imbalances of information lead to disadvantages for you pretty quickly. All it took was some bureaucrat feeling petty.
And this is how it looks in the 3rd world.[1] On 31 October, Congress party officials provided assailants with voter lists, school registration forms, and ration lists.[49] The lists were used to find the location of Sikh homes and business, an otherwise impossible task because they were located in unmarked and diverse neighbourhoods. On the night of 31 October, the night before the massacres began, assailants used t…
"The 1933 census, with design help and tabulation services provided by IBM through its German subsidiary, proved to be pivotal to the Nazis in their efforts to identify, isolate, and ultimately destroy the country's Jewish minority. Machine-tabulated census data greatly expanded the estimated number of Jews in Germany by identifying individuals with only one or a few Jewish ancestors. Previous estimates of 400,000 to 600,000 were abandoned for a new estimate of 2 million Jews in the nation of 65 million.[15]"