I am 100% for body cameras on all police. But when that footage goes public, it becomes a possible intrusion into my civil liberties. What if I get arrested on a bogus child sex abuse charge? Facebook provides a good model of what will happen. The perp goes up on a police blotter for mug shots, it goes viral, and even after he is cleared, FB stalkers turn into real life stalkers, pulling up into the driveway in the dead of night and flashing their brights into the living room, or publicly commenting that if they see them on the street, they're as good as dead. Such a thing happened to a friend of mine, and this bullshit mob justice has to stop.
The only way to protect the rights of the accused is to hide police-public interactions behind an wall of secrecy. Want body cam footage? Or a mug shot? Or an arrest history? Get a subpoena, and it better be relevant.