Back when I was a youngster in the 70s and early 80s, it wasn't common to have more than one vehicle per home, but now it's far more common for each home to have one vehicle per adult and for any kids aged 17+ still at home.
It's no wonder the drivers are more angry, there's far more cars on the road, the promise of the feeling of freedom when driving is so rare these days that us cyclists still get to enjoy once we escape suburbia. Driving at/near the speed limit is a dream for many in the UK, far more likely to be stuck in slow traffic or jams.
But so many drivers look at everyone else to make the changes to make their journeys quicker, by using public transport and/or bikes, rather than themselves.
Yet all these road rage incidents increase the likelihood of a cyclist using a car for trips, slowing down the motor traffic further, providing the cyclist is still alive after such an incident.