Oh, I can see the argument, but that doesn't mean its valid(as held by the Court). :)
I mean, technically speaking, the Supreme Court has the power to define a new right, and they don't even have to justify it. Example, when they struck down laws involving contraception in Griswold v Connecticut, (and later applied it to Roe v. Wade).
The Ninth Amendment states (paraphrased slightly) that just because we named certain rights in the Bill of Rights, doesn't mean that there aren't more that we haven't specifically mentioned. There are very few people currently living that would say that people in the United States don't have a right to privacy.
The point is that it is the role of the Court to say what the law is (Marbury v Madison). The only alternatives to a Supreme Court ruling is an amendment. Which we have done. I mean, I didn't like the result of Bush v Gore. I personally think its one of the worst verdicts the Court has handed down in the last 20 or so years. But its still law. And its still legal. I don't like the fact that Bush became President despite the irregularities, but the Court is the authority in these matters, so I can complain all I want.... what I can't say (in a logical, legal sense, not a 'I'm forbidden from speaking way') is that Bush was illegitimate.
I know sometimes that the intricacies of law can be a bit much for some people, but believe me.... once you start to understand the workings, its quite elegant and beautiful.