Two things:
- The article you quoted was written in '04. Other, better studies, might have been done since then with better methodology.
- Here's the last paragraph from Hulbert's article, bolding added
by me: "But wait: All the evidence—as both sides acknowledge—is
seriously
flawed and doesn't begin to supply anything like solid support for
either the hopes of gay family harmony or the fears about scarred
children and skewed parenting. And until gay couples are allowed to
marry, there can't possibly be decent studies of whether the honorable
estate confers the same benefits on kids whose parents are the same sex
as it does on those who have a mom and a dad. In the meantime, it's
quite clear that the absence of good science won't—and shouldn't—settle
a fraught debate. What will help clarify it are experiences like mine,
watching my sister and her partner sharing the hard work and the
happiness of raising their daughter. I can't think of a better argument
for gay marriage than that."
She wasn't necessarily talking about parenting in that article, but
about marriage. And she wasn't taking the kind of strident stand on the
issue your tone would seem to suggest.