What is the author's tone in Soul on Ice by Eldridge Cleaver?

The tone of the book is often negative, though the writer seems honest in his evaluations and observations. Still, as is the case with any work of this type, it's vital for the reader to remember that there's an absolute need to weigh the writer's words. A black man writing about the trials of black men in American is bound to be at least somewhat slanted, just as a white man's account of the same situation would be slanted in a different way.