This is like asking "why did greenpeace not preclude climate change". Because that behavior is widespread across the whole industry, across many countries and

This is like asking "why did greenpeace not preclude climate change". Because that behavior is widespread across the whole industry, across many countries and across 4/5 decades: https://en.wikipedia.org/wiki/Defeat_device https://en.wikipedia.org/wiki/Defeat_device https://en.wikipedia.org/wiki/Diesel_emissions_scandal https://en.wikipedia.org/wiki/Diesel_emissions_scandal Unions, just like any other non-governative organization, are just as powerful as people support them.