Diesel vehicles kill people, period. It&#x27;s very difficult to reduce emissions sufficiently to change that but it&#x27;s nigh impossible to ban diesel cars and trucks from the road. Given that, the only reasonable alternative is stringent tests that push diesel technology to the limit in terms of minimizing health impact. Which is what we have. Could the tests be better? Certainly. But that doesn&#x27;t excuse the cheating. Imagine if airplane manufacturers had been found to be cheating on safety tests. That&#x27;s how serious and how immoral this cheating is.