What is the author's tone in The Wretched of the Earth by Frantz Fanon?

There is an unmistakable tone of anger, or even outrage, in The Wretched of the Earth. As the reader learns about the conditions that give rise to the author's anger, it seems completely justified. The inhumanity of the colonialists, the fear and cowardice of the black bourgeoisie, the tribal rivalries of the natives, and the failure of rebel leaders to articulate a clear vision and to educate the masses about the need for revolution draw Frantz Fanon's ire.