Again, is this a real, rampant, dangerous problem? Probably not. But it's a real use-case (so they don't have to give fake reasons) for state-wide surveillance. Since it also claims to target foreigners (which by definition aren't voters), most locals/voters/politicians won't care, thinking it doesn't apply to them.
Not that I'm defending this, I think this level of surveillance is extremely dangerous. And the most obvious thing is that they'll slowly and quietly expand this to everyone else.
It's also a "permission to enter" some other country. But without it, you won't be flying anywhere.
Then you've got visas, which are "permissions to exist" in a certain geographical area (within a certain time-frame).
We've all had a default assumption that we can get a new passport any time, but it's actually never been guaranteed.
Our current situation might be marginally better than "double borders", but you're probably aware we're headed in a police statey direction all over the world.