That's a pretty good description of why I keep a camera. After the initial excitement wore off, I began to regard it as a form of insurance in case the worst happened. Although I've no problem with using cameras in a campaigning role, as an educational tool or to expose tosspot drivers (and cyclists) for what they are, the ethics of camming up can get a little murky at times.
If I do feel the need to post a video, I try to keep to a few homemade rules, for example no kids (I've a couple of shockers during captured during the local school run that I won't put up), not advertising a new video where I've made a complaint to a company until I've had a response, removing videos if I get a positive response to a complaint. That kinda thing. I don't expect others to follow these and don't judge other people's motivations for posting vids, but it makes me more comfortable about recording.
I had a good six months over the latter half of 2009 with very little grief and so stopped using the camera. However, there've been a few bad and funny experiences this year (the off into the ford could've been Youtube gold), so I'm back filming day-to-day. ContourHD arrived today - yay!