"The mines on the road go boom, boom, boom...."

The newest issue of Rolling Stone profiles Peter Bouckaert, senior emergency researcher for Human Rights Watch.

The Atrocity Hunter.

For Bouckaert, the mass graves in Iraq, like the disappearances in Nepal, sum up how the world still seems unable to confront the crimes of tyrants. Killings go unchecked for years -- and then, when the evidence is finally unearthed, it's squandered. "Time and again," Bouckaert says, "small human-rights problems grow into major conflicts, and no one even pays attention until a lot of people are getting killed. Look at Congo. Three million people have died, and who sat around the table negotiating Congo's future? The guys with blood on their hands. We live in a world where if you commit one murder, you end up in jail -- but if you commit 1,000 murders, you have a pretty good chance of getting away with it."