Fear and social pressure. It's the same reason a new mom won't eat cheese or fish for the entirety of her pregnancy. For a small price (inconvenience), they a

Fear and social pressure. It's the same reason a new mom won't eat cheese or fish for the entirety of her pregnancy. For a small price (inconvenience), they avert assuage that fear. Secondly, social pressure. While it's entirely unlikely your child will be kidnapped at a playground if left unattended, it's extremely likely someone will call the cops if they see an unattended little kid.