We will eventually address the root cause; self-driving cars are around the corner. Unfortunately, we cannot do that now. Therefore, we should address the second biggest cause: smartphones.
Besides, eating, doing make-up, and fiddling with a CD player are absolutely nothing compared to what people do on smartphones nowadays while cruising in a hunk of metal at 60 mph.
Eating and applying makeup (women) also contributed.
Humans have to recognize that driving demands 100% of their attention.