As 'aenario said: scripts like these dispel the following narratives:
* That police cameras are tamper-proof.
* That the police are capable of responsibly handling the data they record (cf. the recent Twitter thread about eBay-purchased cameras).
* That cameras are an effective and fool-proof check on police malfeasance.
But even beyond that: if I was a defense attorney whose client was the subject of police harassment, I wouldn't trust any footage turned over by the police. I'd want to have the original recording device itself imaged by my own consultant.