Assuming the reports in the media that VW cheated in emissions tests are correct, all I can say is they must be stupid and they should have known better. If the reports are correct this is a scandal and is unforgivable. VW should be banned in the USA for this unethical behaviour. Heads will roll, but at a corporate level they should not have cheated. Bad, bad, bad on their part. Almost unbelievable from VW.
See http://www.bbc.co.uk/news/business-34325005 .