Ok I'm not into killing people, but I'm suspending that for the sake of pondering this.
I'm gonna say 70,000,000 (shit that's so many people!) is preferred. As much as I believe in the preservation and protection of cultures, 30,000 human lives trumps it.
I have faith in the people who remain to keep humanity and all the life that breeds a living, growing culture to keep evolving into new cultures and languages, and valuing old cultures over new ones is more nostalgic than anything.
You hem me in -- behind and before;
you have laid your hand upon me.
Such knowledge is too wonderful for me,
too lofty for me to attain.