If you look further back in the Chicks' history, you'll see that their material has often trod a fine line, morally speaking.  I remember when they released "Goodbye to Earl," which basically advocates killing an abusive spouse.

Of course, what I thought was interesting about this album was that, after proclaiming that they were no longer "country" artists but "pop" artists, they go back into the "country" market.  Could be they just wanted to challenge their critics.  Or, it could be that the pop market, which probably supports their politics better, was totally apathetic to what they had to offer as a product.  Your choice.