I don’t think you understood the point I was trying to make. What I’m saying is that if a situation is, on average, a bad environment in which to raise children, we should not adopt children into such situations, even if a few of these situations could turn out well. Note that it’s not about legality, but rather about the well-being of the child. For instance, alcoholism is perfectly legal, but you wouldn’t let an alcoholic adopt a child.
Since homosexual households are, on average, far worse places to raise children than normal households (as shown by studies such as the New Family Structure study), we should not place children in such situations. While it may not be as bad as a meth dealer, it’s still quite bad. We should also keep in mind that male homosexuals are in significant physical danger due to their high rate of AIDS. In fact, they may be in more danger than your average drug dealer; there are about 9,000 murders a year but over 17,000 HIV/AIDS deaths per year, and the CDC stats that active homosexuals account for only 2% of the population, but are responsible for almost 50% of all new AIDS cases.