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I guess many of us have closets full of ignorance and bigotry, but not all of us choose to open it for an audience like Keillor does here.
Just because something is "natural" does not make it right or wrong; Hume settled this philosophical issue over two hundred years ago. Having children and passing along genes might be a "goal" of natural selection but that's a descriptive evaluation, not a moral one.
And I'm not even going to go into Keillor's borderline slurs against homosexuality.