Maybe they don't, but I get it. Optimizing for lower emission doesn't mean highest reliability, or even necessarily highest fuel economy. Emissions parts can fail and be expensive to replace. That doesn't mean people should be allowed to delete emissions. Last time I had my cats fail, the cheapest option was to saw them off, I didn't do that.

I understand and I don't care. Your personal interests as a diesel truck driver don't override others' interests in health and clean air

Site full of hackers who would fight to the death over open source and their ability to run their computers the way they want to, but when it’s about car enthusiasts instead of computer enthusiasts, suddenly nobody cares.