Exactly. The police can read all my letters if a judge allows it. They can tap my phone, bug my bedroom, track my movement, perform a cavity search, take my blood and DNA, detain me, and if I make really bad decisions even kill me.
And I am totally fine with that in principle, only not with a few somewhat minor details and missing checks and balances.
I want _my_ government to be able to do all that, according to the laws of _my_ country, which I am able to change and influence.
Yes, that is fine. I don't want _your_ government, which I can't elect to read my data at all however. A good example is say data mining for giving/not giving visas. It's a much more murky area without a typical due process - there is someone making a judgement call what is "more" or "less" likely, not proving anything beyond reasonable doubt. I would vastly prefer if I control what I give to _your_ government for dealing with this kind of process as opposed to what they can mine from random US companies about me (that I might not even have an account with - facebook knows a lot about me and who my friends are despite me not having an account there and not agreeing to any T&C at all).
And I am totally fine with that in principle, only not with a few somewhat minor details and missing checks and balances.
I want _my_ government to be able to do all that, according to the laws of _my_ country, which I am able to change and influence.