There's a big difference between a few rednecks illegally modifying their personal vehicles and a company selling millions of vehicles that fail emissions standards and trying to cover it up.
VW sold approximately 475000 affected diesel vehicles in the US (compared to approx. 84.5 million car sales in the same time period).
And while this hasn't been public knowledge, it is not that surprising, because it has been public knowledge how much the mileage tests are gamed, so it's not surprising that all other tests are gamed as well (and, specifically, using defeat devices is also illegal).
https://www.theverge.com/2017/7/24/16021292/german-car-compa...
Now, yes worldwide 100,000's of people die every year from air pollution but simply giving up is a poor solution. Further, you can't make getting caught have similar penalties vs. cheating or you promote cheating as having zero downsides.