Concept vs. execution. 

The idea of a driverless car being used many times by many people to reduce car ownership and congestion appears Utopic, so funds are spent to chase the dream.

With no human monitor present in the car, enter a smelly sitting space full of garbage or worse.

If adopted widely, most humans trudge in predictable programmed vehicles, while some drive their own for comparative advantage.  Which group do you think people want to be in?

For me, perhaps the idea of being able to send my car home after dropping me off downtown and then coming back to retrieve me at the end of the day will be save me on parking, though if many do it welcome to even higher congestion.

But they invest in the dream.....

(Personally, I think most of this is to eventually replace commercial drivers of large trucks and delivery vehicles, rather than personal transportation).