Except that's kind of the crux of your argument.
No it isn't. I don't believe we (as a society) should ever be blase about violence as entertainment. As moral beings, violence and murder should be abhorrent to us; and by extension fiction depicting such should be unappealing.
And yet we are also biological constructs, subject to a variety of primal urges which are entirely amoral in nature. Violent entertainment (sports, films, games) is not of itself problematic, it has therapeutic value and allows us to relieve stress and indulge our base nature as predators in a way that is generally harmless. The specifics, however,
do matter: relative and absolute quantity, context, degree of abstraction, etc. In my time as a gamer, I've probably killed millions of virtual people and yet I do not hesitate to describe
Manhunt as filth. Violence is not a male phenomenon; females are violent, and appreciate violence. The fundamental nature of the beast is the same, the differences are merely biochemical, to which it makes no sense to ascribe any particular moral value.
My earlier comment about males being replaceable is that, well, they don't bring anything to the table that the species couldn't do without (and, indeed, be better off without) at this point. The most significant negative impact would be a reduction in the pace of 'advancement', technological or otherwise. Males tend to push the frontiers, an extension of their greater aggression. But I don't rate 'the progress of the species' very highly, it's the happiness of the ~7 billion bubbles of consciousness that matters, not whether or not they've achieved nuclear fusion. And there's never been any significant correlation observed between material progress and happiness. I'm not quite sure how folks survived before film myself, but evidently they did.
The real question is whether women could survive without men. We've seen what happens in reverse: we call it 'the army', and it is perhaps the most terrible of all human inventions.