This is just part of the reason mass tracking is bad, you never know who is going to end up with the data.
Breach of privacy is bad in itself. Thats not the parent's "formulated opinion", it's something well discussed, with extended arguments, that many people agree on.
So it doesn't matter "what they're going to do with it".
The same way your spouse going over and tracking your internet searches and mails is bad, no matter if they don't do anything with it.
(This of course holds for the whole world states that do that shit, not just China).
Is killing evil? In some contexts, yes, in others no.
The issue is a lack of context in affairs on the other side of the world, in a culture and the lives one has no knowledge about. To levy moral supremacy over others without an attempt at context is what starts wars and disagreements.
Take this thought experiment on the importance of understanding context: If i walk into a room and levy my supreme morality by shooting you in the face because i Just saw you shoot a man would be a crime, because perhaps I did not witness the context from 5 minutes earlier of that man shooting another man (which is why you shot him in the face, and ultimately why I shot you). Who's right? Who's wrong?