a car has just enabled the lifestyle you choose
to a point yes, however, they are a necessity since there was a decision taken by previous generations to not invest in public transport, and to actively dismattle public transport infrastructure that means that the lifestyle available in the city without a car is not available to the majority of the population who don't live in London or the small area at the very centre of other major cities. There isnt' enough space for the majority of people to choose to live in city centres, and public transport isn't adequate in many other areas to go completely car-less. We arent talking about just "middle of no-where rural living" - but many towns just outside large cities.
In our town, we can easily get a fast train into London - or to the large towns down the train track the other way, but that's it. There is little public transport around the town. There is little public transport to supermarkets, leisure centres, even the local A&E would be over an hour on infrequent public transport compared to being a 20 minute drive. The towns that are only a 20 minute drive but on a different line into London would take over 90 minutes to reach on public transport (requiring going in and then out again of London).
It's now a "chicken and egg" issue - there's little and infrequent public transport, so everyone owns a car (even if they commute into London 5 days a week, everyone I know round here has at least 1 car as well so they get around on weekends, get to supermarkets etc), because everyone owns a car, there's no demand for the public transport other than the train to London, and the public transport that does exist is relatively expensive and inconvient.
I can't see either major party particularly caring enough to invest heavily in public transport outside of London, that would probably make a loss for 20+ years until habits were changed, and even then, the low volume of passangers would probably mean that it would never make a profit.
Until as a country, we take the decision that the environment matters enough to put money into reliable alternatives outside of city centres (not just rurally, but within and between small towns), then it's unfair to point the finger at individuals making travel plans based the limited options they have.