Because of software and electronics combined, yes.
> What do you envision going wrong?
One of my closest friends purchased a VW Tiguan last year and not two weeks into his ownership the car left him stranded at the side of the read because of a coolant hose or something similar. If VW cannot make a simple hose not break after only two weeks in a 30,000 euros car I cannot trust their software verification processes and I'm not willing to spend that much money in order to find out. In other words, if they cannot properly verify a simple hose I cannot trust them with properly verifying software.