This book is difficult, took me several months to finish it because I got half way through, had to stop, and then restarted it recently and read it all the way to the end.
It's depressing. Of course it is. But it's a good depressing. It is a painful, reaffirming depressing that refuses to pull punches, refuses to apologize for what it is, for how it exists in this country of justifications and denial, of historical rewrites and hypothetical utopias. It is so depressing because for all that way posture and astound at the ideas of horrible things happening "in 2015/2016/these days", little has changed, and it is difficult to feel that much will in the future.
The book doesn't lie down and sigh in the face of such things but puts into reality how long and possibly impossible the struggle is, which doesn't mean that the struggle shouldn't happen.
"Required reading" is right. We are all caught in what this book sees, and that makes it important.