Actually, it sounds very much like John Nash's argument. Calling any deviation from your viewpoint "socialist" is (on FR) akin to using the "Nazi" argument. It's an attempt to shut down the discussion, not engage in it.
If someone is viewing child pornography but never abuses children, is he doing any harm? Absent the issue of how the pornography is produced, you can validly claim he is harming no one. But society has a responsibility to ban child pornography because the freedom gained by those who could view the matierial without acting on it is inconsequential compared with the cost of those who can not.
Making such judgements is a requirement of a responsible society.
That said, nobody has mentioned (on this thread) making homosexual behavior illegal. Nobody has even mentioned making it illegal for the gays to gather at Disney World every Father's Day and ruin the experience for the normal families who want to see Mikey with their dads (although Gay Days at Disney, in itself, says something about the homosexuals). What we have said is that we don't want to recognize it as the equivalent of heterosexual behavior. So far there is no compelling reason why we should.
Shalom.