Darfur holds the world’s gaze because of that magic word, genocide. The word, implying that there are clear criminals and clear victims, has been perhaps the single greatest attention-getter for efforts, however feeble, to end the fighting and organize relief efforts, even though the fighting has lately turned in directions that indicate the situation was never so clear-cut. The conflict in Congo, by contrast, long ago descended into a free-for-all with many sides. Instead of Darfur’s seeming moral clarity, it offers a mind-numbing collection of combatants known by a jumble of acronyms. And that has been a particularly cruel fate, since the long-lasting war there in fact had its roots in the greatest mass killing since the Holocaust — the unambiguous genocide of 800,000 mostly ethnic Tutsis in neighboring Rwanda in the spring of 1994.