Genocide 's foot soldiers were neighbors of those they tortured and killed . Many ordinary people are forced into participating , researchers say . While some perpetrators participate unwillingly -- they are forced to kill or face death themselves -- many ordinary people are manipulated into participating in the killing machine voluntarily . Architects of genocide use collective memory , mob mentality to implement their plan . Other tools include propaganda and propaganda .
Genocide 's foot soldiers were neighbors of those they tortured and killed . Many ordinary people are forced into participating , researchers say . Architects of genocide use collective memory , mob mentality to implement their plan . Other tools include propaganda and propaganda .