Well the reasoning is quite simple actually, if you care for freedom then you should care for privacy. Without privacy there's no freedom possible.

Maybe read some of the many posts around about privacy and freedom and rebuttal of the "I don't do anything wrong so I don't have to hide" argument: you could start with the schneier's blog: https://www.schneier.com/blog/archives/2006/05/the_value_of_...

But let me try to make a point of why you should personally care even though you don't know or understand why. This is a case of closing the barn door after the horse is gone, if you later learn the hard way you should have cared and go the extra step of protecting your data, you couldn't go back and get your data back. And the sad reality is that if you have to learn this way, it means that history has indeed repeated itself again and you're enjoying living under a tyranny.