The Abuse Debate

Benjamin Chesterton makes an interesting argument. One that questions much of the ethical tightrope that social documentary photographers straddle.
Its a slippery slope, both the practice of photographing and publishing something so horrible and the notion that we should stop. Would then the image of a dying man on a road in Georgia, Gaza, Iraq, be considered wrong?
What about Eugene Smith's image from Japan of a deformed "Tomoko Uemura in Her Bath?" Is this wrong?
At what point do we as journalists, as human beings, stop photographing? Where is the line?