The article mentions that when you control for such things latchkey do about as well as their peers overall. There are a few things they are worse on (girls are more likely to shoplift for example), but overall there isn't much difference in outcomes when you control for other factors. Parents leave their kids home alone for a short time after school before they get off work and home - and then have a great family life the rest of the night result in kids that do as well later in life as parents that are there after school. Parents that neglect their kids can come home before the kids and still neglect their kids.

Then the article veers into a rant about divorce that from what I can tell isn't as supported by studies.