If the world's only superpower says you're committing genocide and should stop what do you do? In today's modern world, you hire a lobbyist. Of course, if US companies were barred from doing business with you Condoleeza Rice would have to grant you a State Department waiver to do so.
Fortunately for the Khartoum government - the one which has sponsored the Janjaweed militia responsible for the genocide in Darfur - our State Department did grant them a waiver to hire Robert Cabelly of C/R International for $530,000 a year.
On K Street, even genocide can be purchased, apparently.