Can you clarify what you mean here? Do you think the guy who made the joke should go to prison?
>Stating that the local police are acting unlawfully ... as a prank, is dangerous. You cannot convince me otherwise.
suggests that the guy who made the joke did something dangerous and should be punished for it. At least, that's the implication I'm reading.
I think the legal precedent is damaging. I make no judgement on sentencing, as there was no harm done.