I hate it when people say this. At the risk of feeding a troll...
You might be doing nothing wrong and still have plenty to hide from some people. I don't consider going on vacation wrong but I don't broadcast to the internet that my house will be vacant.
What if you don't support the controlling political party? You might value some anonymity.
Sure if the government, and all the individuals within it that have access to that data, are always perfectly honorable you might never have a problem. Does this seem like a likely situation for you to stake your life or wellbeing on?
Giving that much power to the government is just begging one power hungry corrupt individual to abuse it to gain more power.