I see your point, but you are not presenting it well.
I would use a bike, but in my city apart from some specific routes it's suicide, drivers like squeezing you in the traffic, and harassing otherwise. And also all the lanes are for cars.
I won't respond you for your use of "idiot" and "fat arse" towards me. I see your point there, but you are not presenting it well.
For example, do you know the bus network in Murcia? The centre is well served, but if you work a little further, you're out of luck.
Do you know if he uses the car to commute, or just occasionally? Like I said, I use public transportation pretty much exclusively. Yet I'm getting a driver's license, because when my 91-year-old grandmother needs to go somewhere, I'm certainly not taking her by bus.
Should we avoid using personal cars? Certainly. Does that make every car owner an idiot? No.
If you don't want to take your grandma by bus, take her by taxi.