Ecomodder is a big tent. Everything from bicycles to Bonneville.
I've owned and sometimes driven VWs since 1967, and I still haven't gotten over them dropping the air-cooled flat four over emissions standards. I mean, anti-freeze is poisonous to puppies and kittens.
The story isn't just about VW. Did you look at
Why Diesel Needs to Die? Let's see what Europe and Australia do going forward.
I think it's about closed-source, proprietary software and the things it conceals as much as anything. To quote Presidential candidate Lawrence Lessing
"Code Is Law".