The hypothetical example wasn't aimed at anyone in particular. Its was simply trotted out to illustrate the hypocrisy of most adults when it comes to matters environmental.
If people are genuinely that concerned they would walk, cycle or use public transport. Instead, they buy cars, boast about it to their chums, and then drive around with 4 empty seats for most of the cars life. Americans do that but with an extra tonne of metal.
You are wise, and use yours as little as possible. I went down the same route and went for the smallest, least damaging to manufacture and use vehicle I could find, and then try to avoid using it at all.
VW gate is, of course, just the latest piece of iffy behaviour from VW. They have a history of it, dating from wartime atrocities, lying about their involvement in such atrocities for decades, and only finally admitting it in the 90s when most of the survivors were dead as a tactic to minimise the compensation bill... diesel gate, ghastly as it was, is quite tame for them. Probably no mass manufacturer can claim to be saint like, but VW are particularly nasty, and their behaviour over almost 8 decades is such I'm surprised that anyone buys their products. In reality, like the environment, shiny cars and prestige among the neighbours takes a higher priority than such trifles. Trump, Mike Ashley, people,e moan about them but then happily buy VW products without demur, which seems odd to say the least.
And that brings us full circle back to Dallas. People talk, the talk (although Americans less so) when it comes to the environment, but if walking the walk causes some inconvenience then the bunnies and trees can go swivel. In this case an irrational demand for additional levies means the company has withdrawn, so the local government now don't get any taxes at all, and the users go back to their pick up trucks, and the planet rolls its eyes and puffs on another Benson.
No one wins economically, morally, or environmentally, so why so it at all? Because he's the Mayor of Dallas an he can, that's why.