This book is the author's way of exploring these issues, one at a time. Prejudice, racism, and tribalism are, in a sense, variations on a theme. All people harbor prejudices. Racial prejudices are only one form among many. Raise someone in a racially homogeneous society, and similar prejudices are likely to appear. Tribal prejudices are so universal that they probably point to some biological imperative.
What is racism? Is it just one of those things that we know when we see it, or is there value in defining it more precisely? Are all White people racists? Whose definition of critical race theory and/or the so-called great replacement theory do you like?