You know the CVR (if still available - which it likely isn't) could help a PIC.
Purely hypothetical, but if a PIC ever authorised (or went along with) deplaning a pax, but only after a intercom conversation that said pax was aggressive and threatening and a danger..... a PIC could be very grateful for this CVR evidence. May not get you totally off the hook, but would at least demonstrate you had been given inaccurate information.
LEO carry recorders and most of the time it helps them. Of course if it records improper conduct then LEO is screwed. But most of the time this evidence protects.