Sometimes “justice” isn’t the most comprehensive response to evil:

As Martha Minow puts it: in the face of collective violence, “…closure is not possible. Even if it were, any closure would insult those whose lives are forever ruptured. Even to speak, to grope for words to describe horrific events, is to pretend to negate their unspeakable qualities and effects. Yet silence is also an unacceptable offense, a shocking implication that the perpetrators in fact succeeded.” From Between vengeance and forgiveness: facing history after genocide and mass violence (1998), p.5.