It’s pretty embarrassing when the on-line comments about an article are more logical and knowledgeable than the article. Such is the case with a Wall Street Journal op-ed last week that argued Muslim violence does not reflect traditional Islamic doctrine, but is merely a case of arrested historical development. The whole argument is a tissue of logical fallacies and historical ignorance. The author, a professor of history at Harvard, starts by explaining that Christianity was once violent and intolerant, but changed over time, and thus can provide an example for “modernizing Islam.” But most of his catalogue of Christian violence...