I never said I did not get the joke. I only accused you of not getting the original. Humor is subjective. A single word can potentially derail a joke.
Think of it like a song parody. The melody is the same, the rhyming is similar. In this example, I’m merely criticizing that your joke does not rhyme, not that it lands.
As I said, if it had been about gun free zones; it actually works. Unless I’m mistaken, no one is trying to police a no police zone. No one is practicing free speech inside their place. Yes, the commentary is sound just not the same irony that should evoke the humor.