VW has just demonstrated that they're very bad at engineering, resorting to cheating in order to create a marketable product. That is the antithesis of Apple. Buying VW would be a terrible move.
Definitely a poor culture fit. Sort of like the story Airbnb CEO Chesky has told about not buying the Samwer bros copycat site in Europe. If Apple is going to compete, they have to take their best and brightest offsite and let them dig in deep. Should be able to do it for $2b. But a HUGE upside if they get it right.