Here is my short book review on this book at Amazon. I recommend you read it.
Hardy writes this documentary in a way that is easy to read, while still covering the shenanigans that occur "at court" very well.
He notes in Taney's decision that citizens were understood to be able "to keep and carry arms wherever they went." If freed slaves were to be citizens, they could do likewise, and (my words) in effect would mess up the social order.
Today, we still see vestiges of Taney's attitude in gun laws among the states. For example, North Carolina's pistol purchase permit requirement; and Tennessee's carry permit law being a modernized version of her antebellum slave codes.