Gacaca was designed to reward confessions, because the objective was not only to render rudimentary justice and mete out punishment but also to allow some emotional catharsis by establishing a collective accounting of the truth of the crimes in each place where they were committed. During a trial run of gacaca courts, in 2005, there were many reports of corrupt judges, and of intimidated witnesses, including an alarming number of cases in which genocide survivors were murdered before they could testify.
https://www.newyorker.com/magazine/2009/05/04/the-life-after
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