How often, in places where there is a great deal of traffic, do children get hit chasing their balls? How often are mentally disabled people wandering around al

How often, in places where there is a great deal of traffic, do children get hit chasing their balls? How often are mentally disabled people wandering around alone, when they're so disabled they can't work out a crosswalk and a red or green light? How often are non-natives struck and injured in these situations? I ask, because I become immediately suspicious when someone tells me, in so many words, "To think of the children."