> Arguably the two world wars of the 20th century were a consequence of the expansionist tendencies of capitalist economies, and between them deaths were nigh on 100 million.

Wait, wait, wait, hold up - in what universe are Nazi Germany and Imperial Japan capitalist? Both countries had heavy government ownership, control, and coordination of industry. Hitler's party was the National Socialist German Workers Party - the Third Reich state owned all the chemical production and most of the industrial production in Germany. People loosely in favor of socialism don't like counting Nazi Germany among socialists, but they definitely had worker/state control over industry.

Unless you mean to imply that the United States, England, and France started WWII? I mean, you could make a roundabout Treaty of Versailles argument to do that, but clearly the Axis war economies of WWII were not free enterprise/free market/capitalist.