Even history tells us that some tiny bit of harmless personal information may be disastrous in the wrong hands when circumstances change, especially combined wi

Even history tells us that some tiny bit of harmless personal information may be disastrous in the wrong hands when circumstances change, especially combined with automated data processing. In the 1930s The Netherlands recorded the religious affiliation of every citizen inside their resident register (stored on punch cards for use with Hollerith machines). After the Nazis invaded the Netherlands they were able to easily find out who was Jewish, had Jewish parents or grandparents. The consequences those people had to face are well known. Source (german): https://de.wikipedia.org/wiki/Judenkartei#Niederlande https://de.wikipedia.org/wiki/Judenkartei#Niederlande