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Imagine you are a baker in the end of 1930's Germany. You deliver bread every day to a synagogue. Imagine cell phones and apps existed. The Nazi government could now with little effort see you went to a synagogue everyday for the last couple of years so they decide to send you to a camp, although you are not a jew. Meta data is not dangerous you think?

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There's no need for theoreticals - we know very well that Nazis used census data which recorded a person's religion to find and kill Jews(and others). At the time I imagine giving this data to the state felt like not a big deal, but how could they know it would lead to their deaths?

Also no need to go so far back. People are being killed based on metadata right now. Even Michael Hayden (former NSA and CIA director) confirmed this.

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