It's not reporting; it's creative writing
This story from the AP has a provocative headline, sure to appeal to the traditionalists: "Study Links Child Care To Problem Behavior." The study is a longitudinal one, looking at over 1300 children, and one would guess that it would concern parents whose children regularly spend some time in someone else's care.
Except the study draws this conclusion (reported by the writer, Kevin Freking, in the 5th paragraph):
The researchers said the increase in vocabulary and problem behaviors was small, and that parenting quality was a much more important predictor of child development.
and in the 10th paragraph:
The authors emphasized that the children's behavior was within a normal range and that it would be impossible to go into a classroom, and with no additional information, pick out those who had been in child care.
Of course, that doesn't make a provocative story, so Kevin, or his editor, got creative.
Ethics, schmethics.