Sometimes this leads us, especially if we feel the urge to repeat standard bylines, to conclude that "The People's Party are just evil, and that's why they do it." But if the reason for doing it were merely evilness, then we might also conclude the US does it for evilness - something that isn't as much of a goto by-line.
I don't really fully understand why all major governments surveil, censor, propagandize and profile their (and other) citizens - but comparing history with 21st century challenges give us pretty good hints. First, it seems fairly natural for countries to exercise some forms of control of their populations, both to provide a common security and stability (something citizens for the most part benefit from) and to preserve its own institutions (something every government is compelled by).
Specifically in the 21st century it is common practice to utilize international propaganda to disrupt and destabilize opponent populations, foment revolutions by exporting dissent, and to misinform foreign citizens during diplomacy and geostrategy efforts. Indeed, both democracies and countries that mimic the machinations of democracies, need to gain of appear to gain public support for initiatives based on complicated, centralized or even secret initiatives do actually benefit countries as a whole. In many ways autocratic institutions need to control their people less than semi-democratic institutions since ultimately some king or body of diplomats make decisions without the input of citizens.
Digressing further it is doing this sort of analysis that can show why a state engages with the practices that it does. If there is a large desire to reform practices it is these end reasons that must be challenged if the behavior is to alter.