There's the real story. Why does a police force have separate detectives that only work on made-up PC crimes?
I know your question is rhetorical, but we’d better answer it for any visitors:
Because we have entered the Orwellian nightmare of Thought Crimes.
If you hit someone else, that’s just assault.
But if in your mind you hate that person because of some PC-protected class, then that hatred is a crime unto itself.
By so classifying thoughts and feelings, they begin to force us to police our thoughts and feelings.
That is why they are called Thought Police.