No, it's to help keep the motorists honest. I use a
GoPro on every work commute for the same reason. Given how unobservant motorists here are, I don't think for a second that they'll actually notice my GoPro, or that it would keep me from being run over (
and your comment was pretty offensive, by the way). I just know that it might help me in a court of law one day. If you don't believe in using video cameras whilst cycling, that's your prerogative, but please don't belittle those who do choose to use them.