It's important to remember that there is a downside to bodycams. #1) It turns all cops into walking surveillance machines. #2) We don't know yet how much violence it deters, or whether it makes the police more likely to be prosecuted when they commit illegal acts. Initial studies seem promising that it is helpful in some ways, but we don't know how helpful yet.

Personally, I think disarming the police would have a lot more effect than body cams.