In Yugoslavia we were told we were not only naive idealists in wanting war criminals to be prosecuted but that we were actually standing in the way of a ceasefire which would save more lives. The idea was that, by giving amnesty to these ruthless warmongers, you would give them an incentive to stop killing. I found that incredibly naive, never mind cynical. Having been on the ground and having met with these ruthless killers, I knew the only thing they understood was the language of force.

Helping survivors of residential schools in Canada is not the same as the UN sending in peacekeepers to prevent the genocide in Rwanda. But both are a reflection of our culture and of our priorities. Where there is empathy there is always a solution, where there is apathy there is always an excuse.

Storytelling is very important. It is through context and relations that we understand the importance of human dignity. The concept means nothing as an abstraction. It's important for us to understand why people do the things they do, including the monsters - the suicide bomber and the war criminal. Understanding is not acceptance. Understanding is exploring the human psyche. If we want to put an end to violence, we need to have the sort of conversation I had with the teenage suicide bomber.

Criminal trials are fundamentally about individual accountability whereas truth commissions are less about the guilt of the perpetrator and more about the suffering of the victim. A criminal trial is only incidentally a therapeutic or cathartic process for victims. But truth commissions, as we saw in South Africa, have the advantage of giving tens of thousands of people the opportunity to tell their stories, and not only does that contribute to healing but it also contributes to reconciliation, especially when perpetrators also come and express contrition.

There are realities that one needs to deal with, but very often what we are told is political reality is merely cynicism. One could equally say that slavery is a reality, and misogyny too.

When I joined the UN War Crimes Tribunal, it was a realization of the dream of justice, that finally after Nuremberg, the UN is going to put the accused on trial again! And I still believe that accountability that eradicates impunity is very, very important for transforming the sordid culture of politics and power that we see in the world. But we need to be humble about the fact that justice will not bring back the dead.

We must sacrifice something in order to make the world better.