The argument "why do you care about your privacy if you have nothing to hide" needs to be addressed. The problem with this argument is you don't decide what you need to hide or not, the authorities do, and we all know authorities can be corrupted. Just look at the US government right now for example A.
Just as an example. You are gay. You live in a gay friendly place. Until one day, a new government takes office that will incarcerate gay people. They now have access to every one's phones who previously had nothing to hide.
Agreed, I once read someone put it like this: Saying you have nothing to hide, so you don't care about privacy is like saying you have nothing to say, so you don't care about freedom of speech. In both cases the ramifications are far reaching.
> "Why do you care about privacy if you have nothing to hide"
For the same reason you close the door when you are pooping on the toilet. You know what you are doing there, I know what you are doing there, so leave the door open.
That's what I always lead with, if we come into that territory :)
I have nothing to hide and I'm not doing anything wrong, but I still close the door when I'm taking a shit and wouldn't like someone taking pictures of me doing it.
I think this "argument" has always been flawed. I don't need to justify what information I would like to share especially with state agencies. In Germany, this is even encoded in a legal principle called "Informationelle Selbstbestimmung" (informational agency). It's not about the information, it's about my right to decide about sharing it.
Saying "I don't care about 'privacy' because I have nothing to hide" can be compared to saying "I don't care about free speech because I have nothing to say". Which says a lot, frankly.
Just as an example. You are gay. You live in a gay friendly place. Until one day, a new government takes office that will incarcerate gay people. They now have access to every one's phones who previously had nothing to hide.