"Because it's cool" is enough justification for anything. Ever.
We'll make up reasons later to justify it. After all, it worked pretty good with cars.
When public transport is clearly the logical alternative to personal automobiles in every scientifically measurable way, why are cars sold or driven at all beyond the lobbying efforts of the auto industry and actions such as the GM Streetcar Conspiracy?
Me, personally? I like the gull wing doors.
It makes it easier for me to imagine myself as a time traveler.