There is a persistent tendency amongst people (all people, not just Americans) to deny their group or nation’s role in oppression or atrocities — something I discovered recently when I observed that the U.S. has, in fact, supported terrorism in Central America (the death squads of the 1980s). Denial is a tempting emotion. But it is also exceedingly dangerous, and lays the ground work for the reiteration of mass atrocity worldwide.