Drivers that are not fit to drive kill. In this case drivers that cannot pay attention to the road. Smartphones have nothing to do with that.

The lure of the smartphone is pushing a number of drivers over the threshold of insufficient attention. They would be less distracted without.

It's not like drivers had an individually fixed amount of distraction that they would distribute on whatever media at hand, it's the attention that is limited and far too many drivers don't allocate it correctly when their phone is around. Unfortunately, using a smartphone while driving is far more common than using the newspaper while driving has ever been. This has everything to do with the difference between smartphones and newspapers.