The article doesn't mention if the driver was en-route to pick up a driver. Uber should be liable once driver taps on the button and a customer is locked in. He's rushing to get there, like any other taxi who sees a customer flag them down across the road. Makes sense no? That said, this is any company's nightmare. Why don't they just settle and be a good citizen.
My guess is that he had recently dropped off a passenger and was trying to get back to a location that he thought would make it more likely for him to be selected for another ride.
Do you think Uber should be liable then?