Even if their numbers are right (haven't read the full study so I don't know the validity of their methods), what a strange time to draw cause from correlation. One thing that comes to mind is many children raised by same-sex couples are adopted. I'm sure whatever caused the child to lose their biological parents would contribute to their emotional problems.
The other thing that really bothers me about this argument is it is a slap in the face to single parents.
The other thing that really bothers me about this argument is it is a slap in the face to single parents.