Children cannot be held accountable for behaving irrationally and running onto the street without looking. Any accident where a car hits a child (within cities) is fully the driver's fault because you must expect children to run from blind spots onto the street.

You know, the exact thing "defensive driving" is meant to prevent. From Wikipedia:

Driving defensively includes

• Preparedness for all sorts of actions and reactions of other drivers and pedestrians

Children are pedestrians and children regularly act without safety in mind, ergo you must drive slow enough to stop at a moment's notice. 17 mph in a narrow road with many blind spots is too much.