Comment by caconym_
If you believe you are at fault in a collision where police, insurance, etc. are involved, they are going to ask for your statement, and at that point you will be forced to choose between lying or admitting fault. If you're glad that no dashcam footage exists, presumably you are going to lie about what happened! I don't see why this is any different than popping the SD card out of your dashcam and lying about that too—you're still lying, and for the same reason: to evade responsibility for a collision you caused.
I think this is a pretty black and white and simple view of things, fault is not always 100% clear, and CLAIMING fault is different from explaining what happened _from your perspective_, and letting the other driver do the same. But I'm not actually speaking about simple fault in a basic traffic collision.
Obviously 99.999% of traffic collisions never get this far, but I'm speaking more of the world of courtroom legal drama where you'd rather not have your in-car conversations recorded, or the fact that you drove around the block of the house where the murder occurred at 3am.
I think there's a huge asymmetry between the upside of the dash cam and the downside of self-surveillance. I'm much more likely to be in a fender bender than accused of murder, but I also _simply don't care_ if the police say I'm at-fault when I don't think I was, driving my insurance rates up for a few years. But I'm deeply uncomfortable with the idea of recording myself 24x7 whenever I'm in my car.