You probably feel terribly shook up after hitting a child on a bicycle - especially since you are a bicyclist yourself.
I will never forget backing out of the driveway and running over my child's bicycle. Nobody was on the bike, but the experience was so tramatic that I was shook up for days. Just to think what could have happened was so dreadful. That was one incident that pushed me toward a mostly automobile-free lifestyle.
The reality is that no amount of activity, promotion, or campaigning is going to prevent kids from doing dangerous things - they don't read and they are difficult to reach to get the safety info to them.
Drive safe and look at the sidewalks as well as the streets.