You're not getting the point, are you? This is about car dependency. No one is suggesting that every last car should be scrapped, we are saying that lacking a choice in how to get around is a bad thing. Yes, many British (and Dutch and Danish) people own cars. But most of them don't use their cars for everything. They use the most appropriate method of transport for the situation.
For example, a fairly well-known hill farmer near here obviously mostly uses Land Rovers, tractors and quad bikes to go about his business, because they are the most effective transport when you live on a hill farm. But when he and his wife head down to London, they take the train. Because the train is a viable option for getting to London (even on a route served by the hapless Avanti), the heart of the city hasn't been decimated to build car parks and motorways (see artist's impression below).
In the US, many people have no choice but to drive. Walking to a grocery store is often dicing with death. Zoning codes in many jurisdictions prevent shops and bars from being opened in residential areas, so people are forced to drive to them. And then drive back, after a few drinks.
And yes, the UK will have to shoulder the cost of maintaining aging motorways too. But trust me, the cost per mile of maintaining the Katy Freeway will far exceed the cost per mile of maintaining the M4