As I said, look around. China has been (and still is) doing it today with Uighurs. It’s not a new behavior.
I'm not arguing that you don't a valid point - broadly speaking. You do.
But you made a very specific claim, and that was what was being questioned. That's all.
Or do you think that is actually not happening right now?
You were asked to back up this claim but haven't cited an example of any country currently "using census data" to "round up and murder" people.
Is China currently using census data to do horrible things? Are other countries? Maybe. I have no idea. I wouldn't be all that surprised TBH. You may be correct for all I know.
But that's not the point... The point is that you made a very specific claim and you still haven't provided any specific examples or evidence.
What’s the point?