I personally do not care about privacy. I see no reason why I should.
It's just my opinion. I know other people do but please don't generalize.
When late 19th century Germany started recording census data, a clerk made the suggestion that they should also record each person's religion. No one objected. What could be the harm, right? They were already collecting age, gender, occupation, etc. so they might as well collect one more thing.
Half a century later, the Nazis were able to use those same historical census records to identify whose grandparents were Jewish, and therefore who must be Jewish, which greatly aided in rounding up those people.
So imagine: a piece of information commonly believed to be harmless to reveal about oneself became the primary method that facilitated one of the greatest atrocities in human history.
The lesson here is that tomorrow's government may turn out to be very different than today's. Information you willingly reveal about yourself today, or don't mind others (such as the government) finding out about you, may be used against you, your children or their children.
That is why privacy is supremely important.