What is the theme in No Future Without Forgiveness by Desmond Tutu?

The wickedness of humanity is the central theme. Tutu notes that in a report entitled Apartheid Terrorism, which is published in October 1989, the destabilization caused by the South African Defense Force. This is responsible for the deaths of 1.5 million people, 4 million refugees, the destruction of $60 million USD in assets, and the deaths of 100,000 elephants and rhinos between 1980 and 1988. The brutality of social activity is staggering and Tutu wonders how human beings are capable of sustained cruelty and wickedness on such a scale.