Yes? These things directly follow one another: VW are obsessed with letter-of-the-law compliance, so things like end-runs around test routines are obvious solutions.

And VW didn't single-handedly destroy the diesel market; economics and physics did. Almost every other manufacturer was also fudging the tests results in some way. But more importantly, building a passenger car diesel that meets NOx targets doesn't work; by the time a passenger car diesel meets modern NOx targets honestly, the car contains a ludicrous precious metal loading in the catalyst and is only a few percentage points more efficient in terms of consumption and CO2 emissions than a petrol car and the math doesn't add up. Diesel is just not a practical solution for passenger cars; it never was in most ways, but it took the EU a long time to restrict NOx pollution to a sustainable level and expose the physical issues at hand.