There are useful secrets like business secrets or planning a surprise party. But you have to carefully protect them anyway. What other behaviors are you thinking of that should be protected against easy searching but which are still publicly visible?
Given that a protest by its very nature is a disruptive event, i consider this fair game. Otherwise you're trying to silence dissenting opinion by outmanuvering, and how is it NOT totalitarian to silence dissent?
There is plenty of acceptable behavior that people, quite reasonably, don't want to be tracked or widely known.
> The particular problem the author mentioned was marriage.
I understand. I was speaking to a larger point, not about this problem in particular.