Like so many other claims that are "research-based," the claims of same-sex marriage advocates that science shows that children raised by "married" gay parents are just as well-served as children in families headed by the child's natural parents turn out to be based on questionable evidence.
Here is Gene Schaerr in the Daily Signal, commenting on the evidence offered by the politically compromised American Psychological Association and the American College of Pediatricians:
... [D]ozens of studies cited to support the so-called “scientific consensus” that the American Psychological Association claims, only eight meet scientific standards for population inference. The rest tell us nothing.
Of these eight, the four older ones found no disadvantages for children raised by same-sex couples compared to other family structures. But as the recent American College of Pediatricians amicus brief shows, all four studies suffer an incurable flaw: about half (40-60 percent) of the children they report as being raised with same-sex parents are actually children with opposite-sex parents, either because of coding errors, or problems with the census data on which the studies relied.
In the end, this “dirty data” problem either invalidates their findings, or makes relying on them extremely problematic.
This leaves only four studies that are methodologically sound. And as the American College of Pediatricians brief shows, all four—the four most recent—find that children do not fare as well when raised by same-sex couples as when raised by married, biological parents.
To the contrary, such children often experience significantly higher levels of events or conditions such as being arrested, using marijuana, being depressed, having a learning disability or other psychological or developmental problem—and are less likely to graduate from high school. As adults, they are more likely to be unemployed, receive public assistance and to have an extramarital affair.The fake evidence hides an ideology (a belief system impervious to evidence). Read more here.