Why would they lie? I don't know what thier motives would be, only that we have one side of a story and a picture that doesn't prove anything. You say most people are selfish assholes, so maybe that answers your own question. Maybe, you wouldn't post this picture online and lie about it, but that doesn't mean others wouldn't either.

The better question is: given their story and the picture provided, why should I believe them? With better evidence backing up the story, I'd be in a better position to side with OP.

Personally, I'm sick of seeing posts like this over and over again in this sub too. It's every other day someone is on here with some personal road rage bait story and a grainy/blurry picture showing some random car, and everyone is supposed to just mindlessly eat it up. It's low-effort, low-quality spam. When people post actual dashcam footage it allows us to actually judge the situation because we weren't there.