Cut off and slam the brakes is a common method for insurance fraud. You can see examples of the scam by searching for Russian dash cam "caught in the act" videos.
That the dude also went all road rage is strange, but PTSD or not, that video is gonna get him in trouble of some kind in court. It must be especially bitter for the paralysed woman vet, to be attacked by a fellow soldier, who is also a war casualty.
By the way, I read Fred's first post as being very bitter snarkasm, not an actual "let's lynch him" retort. Glad that got clarified as just a misunderstanding. Because I find it funny in a way that it almost turned into a case of thread rage about a post on road rage. O, the internet...it really Is an "information highway", traffic incidents included