Sure, the presumption of innocence is a two-way street, but it does not always work these days for either party. But to be fair, the article and the original p

Sure, the presumption of innocence is a two-way street, but it does not always work these days for either party. But to be fair, the article and the original paper discuss all your points as well. There is no "blame everything on the police" attitude there. And body cameras help with all of those: They can substantiate claims against misbehaving police officers, but they can also prove their innocence. Also, it may very well be that citizens, when aware of the cameras, are less confrontational and ill-behaving towards officers, not just officers on best behavior. And if an officer OR a citizen behaves badly, with body cameras you get instant video proof, which helps the victim no matter if the victim was the citizen OR the police officer.