I do think you make a good point.
That said, there are also plenty of people that do choose what they perceive to be the 'high road' despite the consequences, and based on my personal experiences these people are not rare, but not plentiful either.
Most of us try to find a kind of 'middle road', and the conviction of those that do choose these high roads can be extremely valuable, as I personally believe the default is that it's easy to go for the 'low road'.
All that said, I do find people who tell others to take the high road without doing so themselves, or from a completely different situation, to be tiresome.
As for your unpopular opinion: part of me thinks that the cat's out of the bag and we'll have to find a way to deal with a world where privacy is basically non-existent. I could see a way forward in such a world provided that privacy does not become yet another thing that only those in positions of privilege or power can afford. It could be interesting, maybe even positive, if lack of privacy becomes a fact of life across the board.
That said, I think it's too early to conclude it's all a lost cause, but I quite likely might be naive about all this. Mostly I count myself lucky that I can think about these matters with no obvious or direct 'skin in the game'. For now, at least.