Worse still, a government comes to power in your country and changes the law so you get the death penality, and it's retroactively enforced by looking through everyone's location history.

Yea, this is a troubling one. I brought up my original post as a thought experiment and I think some arguments presented were better than others.

Governments are fallible just like human beings. I suppose in some sense it is arrogant to believe the US will always remain a democracy and certainly other countries have much more tumultuous histories.

I still like the idea of a totally open and transparent society but without something totally incorruptible and unbiased taking the role of government it does not seem practical.