Perception of safety... to other drivers on the road. This is a research prototype, there is no target consumer yet. The main goal is having a car that people will feel comfortable seeing driving itself on the street, not buying, yet. So, "toy car" is what they should be going for, at this point ;)
I guess I'll go with the default assumption that people at Google are smart. What worries me is that a company as smart and as experienced as DEKA could produce something as geeky as the Segway. Don't want to see Google afflicted by the same nerd-blindness.
an escalade is pretty shit as far as safety goes. it's an active danger to other road users and a magnet for rollovers.