There are loads of lonesome children out there. Thousands of children who are longing to have a family, who want to be loved. For a child, it is better to have some family than no family at all. Of course, in a family like that there would be only male or female parents. On the other hand, single mothers are allowed to adopt children. There is also a large number of divorced marriages where children live with only one parent and no one seems to be bothered by that.
To sum up, even though lots of things have improved for homosexuals we should still fight against the intolerance and xenophobia of many people. Registered partnership and allowance to adopt children is definitely a good way to help homosexual community to have equal rights with the heterosexual majority. I think they deserve it.