Or maybe detect people who might be unstable through paranoid ramblings about how Apple is out to get gun owners before they can "take a stand against the tyranny".
Why do I get the impression this is an attempt at being mysterious because "can't openly state something that's wrongthink!"
When really no one would consider what you're vaguely implying "wrongthink" or inflammatory at all. They'd probably just consider it "normal wrong" and poorly supported by reality...
No mystery. You can simply make the claim that Apple would detect anything that's anti-Apple. Why not? It isn't like that the company has anything approaching morality, aside from perhaps the occasional craziness from the worker-drones there.
...detect people who might be unstable through paranoid ramblings about how Apple is out to _fill_in_the_blank_.
The spice must flow to keep those stock options in Cupertino rising.