another survey revealed that even engineers continue to be wary of fully autonomous vehicles
That statement makes it look like it is almost a surprise.
Most engineers that I know are more concerned with the problems that can arise with fully autonomous vehicles than Joe sixpack, simply because they have at least some idea of how it works.
In an uncontrolled environment, there will be something that you did not plan for, and it is just a matter of time before there the shit hits the fan.
For Joe sixpack, a computer is a magic box. They don't know how it works, and they don't care. Until something goes wrong.