Hope the driver is never charged for his involvement in delivering them to the hotel.
If it were a robbery or a drive-by shooting, he’d be considered a co-conspirator. It is not uncommon for the driver in such cases to face stricter sentencing than the shooting/robber (when they plea bargain in exchange for testify against the others).
Also, and this is key, he's the one who called the cops. The article says the cops thanked him for alerting them.
Given this I really don't understand your comment at all.
That’s when the driver knows what’s going on and does nothing to stop it. In this case he didn’t know until the ride had started, and he called police immediately once it was safe to do so. No reasonable person could call him a conspirator.