That's because they sometimes occur near places like schools or public parks where contact with children is extremely likely to occur, if not inevitable.
I know I've said this already on Twitter, but I've actually witnessed two instances of this last year at a concert theater (I freaked out and ran on the first one though). Third case was just this past weekend at a convention and now I'm not sure if I'm either blessed or cursed. XD
Ohhhhhhhh yeaah, definitely!!