On the odd occasion that either I or my wife need to drive a car into town and don't have to take the family too, there is simply no way either of us would ever voluntarily choose the larger vehicle for the simple reason that it's much, much harder to park it.
The little car will happily fit in every single car park space known to mankind. It fits into car parking spaces that aren't even real spaces, too. It's the single best feature it has.
It's got a tiny engine, and is hopeless at accelerating hard - particularly up hills - but who cares? It gets up to four people from A to B in relative comfort and great efficiency. It cost us $10k, brand new.
Could it be that we should talk about setting higher taxes on more expensive and/or larger-engined vehicles? Downsizing our vehicles might be a way to help save the planet without compromising on personal mobility.