China does it to protect their people from people that want to undermine and dismantle the party
This is true! This is exactly what we want to happen! These are security reasons from their perspective
Can you see how that is not so different? In the US we are as oblivious to the exact nature and motives of security threats too, and tolerate our border and surveillance agencies to preempt an unspecified threat. The mere existence of scrutiny doesnt make the systems that different.
Put it another way, where do you draw the line in terms of how the government is allowed to behave in regards to its citizens since you can pretty much excuse any abusive behavior under the reasoning of "security reasons"?
I believe the Chinese government apparatus is in that business.
Regarding the surveillance for surveillance sake, I don't see much difference. I see you describe exactly what I did.