that really is down to you, yes you probably will focus on stuff when you 1st put the camera on, but eventually you just get used to it and stop focussing on every bad pass and use the camera for when you really need to, I've only acted on repeated bad driving by council/commercial vehicles (the coach that KEPT on overtaking me closely) I've never sent anything to the police as I believe it would be a waste of time, I also ride through the border of 2 counties so they would probably pass the buck.
The rule seems to be you will get bad driving whatever, you will get physically/verbally assaulted only if you react to the bad driving (airzound, shouting, knocking on windows etc) and it will be worse if you ride through bad estates and react to boyracers/single middle-aged men/van men. Also if there are loads of cyclists you blend in, on my route I'm the only one, riding a predictable route at the same time I stand out.
If you have access to Roadsafe things are a little different, you can just ignore them and send the footage in.