One of the news items that has shaken international consciousness this week is that 18 workers from Doctors Without Borders (MSF) have been reported for sexual abuse of all kinds against refugee women in South Sudan in exchange for food. What happens in human nature that makes someone capable of exercising this violence against those who have nothing?

Albert Viñas is a 62-year-old from Sabadell who has been working as an emergency coordinator for Médecins Sans Frontières (MSF) for two decades. The compilation of the 48 missions in which he has participated is a compendium of the worst humanitarian disasters that the world has suffered since the turn of the century: famine in Kenya, war in Angola, massacres in Darfur, an earthquake in Haiti, the latest jihadist offensive in Mozambique or the current crisis in the Ethiopian region of Tigray. Next week he will travel to South Sudan. He could explain a thousand terrible situations that he has lived in his own skin, but instead would rather tell a positive story: "In 2003, in the Democratic Republic of Congo, there was a little girl who had lost her speech after her parents were killed. I was going from here to there and one day when I was taking her there she said to me muzungu, which means white man, and that's how she started speaking again.