When I was getting my learners permit I was practicing on a curvy mountain road. I saw a person with a camera phone on the "drop off" side of the road, taking a picture of from what my angle would've been a boring cliff face. But I knew that a camera phone photographer was probably actually photographing a human, who would likely be on the other side of the blind corner. So I slowed down, despite my instructor chasti…
Your own story disproves your conclusion. Your driving instructor, like many (many) other drivers, didn't make the infererence that you did. People don't drive well. Cars are dangerous. The criterion (really the only criterion) for whether or not automatic vehicles "should be on the road" is whether or not they are safer than the alternative. And that certainly doesn't include "being as good a driver as jdavis703 was…
Being engaged in a particular role relative to a situation can (I believe) alter one's capacity to perceive and respond to it.
This isn't to say that for definite the instructor would have had the insight described in the parent post, but it is to say that you can't rule this out just based on the information that as a passenger they didn't have the insight.