How do you lose a child?

I am confused. How do you lose a child for hours? I am not talking about teenagers, where you might not know where they have been for the day. I am talking two year olds. Last week there were 4 children, two years old or under, found , walking alone on the streets of Phoenix . All of these children had been found by strangers. All of these children had been in fire or police care for hours before their parents noticed. Not one of these parents called the police when they noticed their child had been gone for hours. They just hopped into a car and drove around their neighborhood. The parents were found by police, who noticed that the cars seemed to be driving in a strange manner. One parent stated that they had three children and just didn't notice the two year old was gone. This child was found over two miles from his house. Another parent stated she thought Dad had taken her with him. Mind you , if she thought dad had this child, why was she searching for her? Also , she stated that dad left for work at 3:00am but she had fed this child breakfast with school aged kids. It appears that little one left home at the same time other kids left for school. Come on people, I have NEVER lost a child, I don't know anyone who has ever lost a child for HOURS from their HOUSE. Most of us have learned, early, if the child is quiet, go find them. It almost always means they are into something. Also I would like to add...If you find your child is missing.....First, call 911, have at least one parent stay home in case your child comes back, have friends and family look for the child. Do not do this your self. Get help. Maybe, like last week ,we can save you a search, we might already have them. Don't forget to check your locks, do they work? Can the kids reach them? Doggie Door? Or maybe you might try watching them a little closer. I love meeting your children, but I would rather do it another way.