I've ridden with and without cameras. In my experience, I noticed more wreckless driving with the camera. And I spent the remainder of such rides with the incident still in my mind as it was on camera. Without the cam, I find I tend to calm down sooner and eventually forget about the pillocks.
But I have had success in the police issuing warnings and notices when I've submitted footage.
You'll find these types of driver tend to appear in swarms. You'll have a few good rides and then a bunch will emerge from the woodwork all in one day or two. I had five of the ba****ds yesterday and got into a heated arguement with one when I caught him at the lights.
Don't let them win by giving up due to their incompetence at the wheel.
