I remember reading his heartbreakingly scathing critiques of Madeline Albright and Bill Clinton's cowardly actions regarding Rwanda.
I remember his stressing that their's was not a failure to intervene but a decision to block all attempts at intervention.
The UN had well-armed and trained Belgian troops in country that could have stepped in to stop a genocide conducted with rocks and gardening equipment. But Clinton thought that talk of genocide and UN intervention would negatively impact the Democrat Party's chances in the upcoming congressional election, so they blocked any action.
800,000 people were slaughtered.
IMHO, of all the evil done by Bill Clinton his failure to do anything to stop the appalling slaughter is the worst.