The discrimination against homosexual adults who want to care for a child is what it is, and make no mistake, what it is is ethically wrong. But those women are adults who've found their place in the world and they'll overcome the adversity, angst and anguish some here would have them endure.
Be that as it may, the parentless children are the biggest losers in the situation described in the OP, and, apparently, people think that those children's loss is acceptable because the people who want to give them stable homes, a family they can call their own, educations, soccer teams, vacations, trips, a network from which they might launch a career....all the "big things" and "little things" that accompany being a child who's loved by his/her parents, that issue from being a child who has a stable foundation upon which to build his/her place in the world into which s/he'll mature into adulthood....How can one deny all that to a child, any child! No! Hell, no!