Demand for Kaplan's unorthodox analysis became more acute after the September 11, 2001 attacks on New York City and Washington, D.C. In his book, "Warrior Politics: Why Leadership Demands a Pagan Ethos", published shortly after 9/11, Kaplan offered the opinion that political and business leaders should discard Christian/Jewish morality in public decision-making in favor of a pagan morality focused on the morality of the result rather than the morality of the means. He also published a pure travel book titled "Mediterranean Winter."