That's one of the problems, and I agree with your idea. It would be vastly better to put the burden of claiming the copyright on the holder, as they are the par

That's one of the problems, and I agree with your idea. It would be vastly better to put the burden of claiming the copyright on the holder, as they are the party who benefits from that action. However unchecked use of police force and lack of effective oversight are also serious problems. These are a large part of what has led to the situation today, where it is necessary to film routine police encounters. And why would police actively try to sabotage a video recording of themself? "If you aren't doing anything wrong, then you have nothing to hide" cuts both ways.