Some time ago, I don't know how long, I wrote in this blog about the book MORAL SKEPTICISMS by Walter Sinnott-Armstrong. After a long time away from that book I returned to it recently. Here is a summary. Although the title, and the programmatic parts of the book, sound as if the plan was the emphasize the diversity of forms that moral skepticism might take, most of the book is devoted to a single argument, which may simply be resisted by moral cognitivists for different reasons. So the real debate is between moral skepticism singular and moral cognitivisms plural. Before I get to the argument, one critical semantic point. There is a distinction, among meta-ethical philosophers, between a normative proposition and a moral proposition. Some thinkers use "normative" as a broader term than "moral" and "normative but not moral" is a sort of intermediary thing between "is" statements and "ought" statements. So if we can't get from n...