I am tired of hatred, Dr Garrigan. This country is drowning in it. We deserve better. Go home. Tell the world the truth about Amin. They will believe you; you are a white man.
In this short conversation there is much that reveals the source of the political problems in the country; there is too much hatred and this hatred has existed for centuries. There is tribal rivalry that has turned to hatred; there is hatred of the white man, of the rich black man, of the ruling classes and the state. There is also hatred of the people by the man leading them. This hatred, when seen from the outside, combines to make an enormous ball of unrest which in some ways enables the outside world to dismiss the country as a place where nothing will improve because the citizens are ungovernable and hate their rulers.
Djonjo knows that not only does the world not believe what the black men of the nation say, they also tend not to even hear it. As a white man, Garrigan has an entirely different platform for illuminating the situation and will be listened to. His eyewitness accounts will be given weight and credence. He will be believed because he is not one of Amin's citizens.
If you are afraid of dying, it shows you have a life worth keeping.
Garrigan, as well as being a doctor, is also somewhat of a philosopher, and given to conclusions such as this one. He believes that because Amin is afraid to die it means that he values his own life. It does not mean that he is a coward, or weak, or as Amin believes, a slave. If he was not afraid to die then this would not prove him brave or courageous; it would merely prove that he did not value his own life very much.
You're a child. You have the mind and ego of an angry, spoiled, uneducated child. And that's what makes you so f*****g scary.
Amin claims he is the father of Africa and as such, Garrigan should show respect to his father. Garrigan takes a different view of Amin's position; he is not the adult figure at all, and his authority is achieved through fear rather than through respect. He is a child; children develop a sense of right and wrong as they grow up but are not born with it, and Amin is like a child who is not yet familiar with right and wrong. He has no sense of responsibility. He sees what he wants and takes it and like a spoiled child is allowed to take what he pleases regardless of the way it affects anyone else. He is also like an uneducated child because he does not seem to have the world knowledge that lets him see the consequences of his actions. This complete lack of ability to see consequence, or to exert any kind of self control, is the root of his power and is what makes him the most terrifying.
