At what point does what we're giving up become worth it to solve all these crimes?
I don't have an answer, I'm just wondering.
Obviously solving 1 or 2 crimes isn't worth giving up so much private information. But 10,000? 100,000? Is there even a number?
The US is comparatively not so oppressive, but there are still plenty of unjust laws on the books and plenty of vengeful prosecutors out there. Even for those convicted of what one might rightly consider a crime, in the vast majority of those cases the punishments are designed to be more effective at "retribution" than "correction". I think it matters to be vigilant when governments are probing the boundaries of what techniques are acceptable.
To further your analogy, one could make a comparative to Cambridge Analytica - where your Facebook data could have been harvested through the seemingly innocuous behaviour of your friend(s).