The question is not, cannot be, "Would this be just in an already just society?" Putting Supergirl in a short skirt, or giving Powergirl big breasts, would be neutral acts in an already just society: some women wear short skirts and some have big breasts, and that's okay. But we don't live in a just society, and asking what we would do then blinds us to the pattern of oppression these facts form into today. Similarly, some actions are called for today as reactionary measures which would not be appropriate in a feminist utopia. Fandom's female identity is one of these things.

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I get so frustrated reading various conversations about various "isms" where there's this attitude like the one you describe and critique above -- where the reaction to female space and the like is "two wrongs don't make a right!" I wish there was a pithy, easy catch-phrase to respond to stuff like that.