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You have a warped view of reality. You seem to think all liberals like to see naked gays in parades, or "support Piss Christ," images which clearly are disturbing to you. You presume much. You understand little.
If people are turned away from noble goals - environmentalism, human rights, etc., simply because a few letter writers take a position they find offensive - then they really have no business even having an opinion. And it's hardly a double standard - while I don't agree with the naysayers on this article, they have a fair concern that basic human rights are being denigrated... as they are concerned with people like Falwell, that basic human rights are being denigrated. In this case, these people are applying the SAME standard. They are objecting to what they think is objectifying a woman, even though that woman does not share their values.
Too bad YOU don't get it.