Incest sells - as much as we are all disgusted by it, people will tune in and that's what sells ads. It's all about the ratings - for any TV show.
I'm not attempting to minimize or suggest incest shouldn't be discussed on national TV, but you do realize the family is being paid, and paid well, to talk about this terrible incident. Although I suppose Internet pornographers, myself included, really don't have much moral highground to criticize.
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