anti-carceral kids on bikes?

look. my friends, as a table, have a Scooby-Doo nonsense vibe. I'd like to run them a Scooby-inspired campaign using KOB.

however, every episode of Scooby Doo ends with the villain getting taken away by the local police. that is not my style.

how would you run a mystery campaign with little to no cops? any suggestions on satisfying endings without the police?