At an organising breakfast for National Rifle Association (NRA) grassroots activists, Samuel Richardson, a man with whom I have not exchanged a word, passes me a note. "Please read the book Injustice by Adams," it reads. "He was [sic] lawyer for US Justice Department who prosecuted Black Panther Case." Quite why Richardson thinks this book is for me is not clear. There are six other people at the table, a couple of them journalists. The fact I am the only black person in a room of around 200 may have something to do with it. J Christian Adams, a former...