Someone said that 'it's the law of the Jungle' - simply put, if you want to pick a fight (or to let go your anger) then make sure you're picking a fight with someone smaller than you. Alternatively, don't bring a knife to a gun fight.
She's obviously a nasty piece of work, simply because anyone who ever, even once, decides it's OK to indulge their inner caveman(woman) in that manner should never, ever be allowed back behind the wheel of a car, van, lorry etc. Having done it once, even when provoked, prison should be another part of the sanction.
He's, at best, dumb. Knowing what we know about people, why did he expect to get away with continuing the argument with an assault (in contrast to her original offence which was not an assault (we've all seen it, but it's not a deliberate attack on the cyclist). Perhaps he's done it before, but this time he got the response that is actually programmed into human and animal behaviour. That's a consequence of adopting the law of the jungle - even if everyone else has to pick up the pieces afterwards.
In none transport environments, people fairly regularly get seriously hurt or killed when arguments escalate out of control. Sometimes drink is involved, but not always. It makes good sense to remember this when deciding how to deal with situations.
Cudzo's comment about fault and cause is apt.
Meanwhile, a post noting that Kent police redacted parts of a report critical of their handling of an investigation into the death of a cyclist goes without comment. That's actually more concerning as it refelcts a much wider set of attitudes.