All dashcams give you is proof of blame. Providing you are alive to sue. In the UK, video has to be agreed by the plaintiff that is constitutes the truth. Though the police may have more sway.

The camera doesn't lie, but it can't tell you everything, unless it sees every whichway. I wish mine had been a dual camera device. Tailgaters are as big a menace.

Sign up on a motoring forum and get some sensible replies rather than rubbish from the "its not trolling because I have a Mudcat id" trolls.
If I had the interest in motoring in general I would peruse the forums, but I am willing to be proved wrong that I strongly suspect trolls inhabit those forums also, and they may not be light-hearted jokers. And how steeped in the history of the common working man are they? Folkies have a different perspective. The ones I would respect, even as GUESTs, would reveal themselves.
One of the definitions of a troll is anonymity.