OK, so we've excluded the materialistic Communist countries from the study. That would explain why sky-high abortion rates in the USSR and China aren't mentioned. It also doesn't mention that homicide, STD, teen pregnancy and abortion are all nearly zero in Saudi Arabia (but that would counter their pre-conceived conclusion).
This study only compares the U.S. to Western Europe. The next quote demonstrates why this comparison is used and what bias the researchers have:
The U.S. is a "developing" democracy? In what way?
This is just another example of America-bashing by Left-wing nutjobs.