Why, Risk, you are getting unfair : appeasement DO work ! Look : it worked for Hitler in Rhineland, Austria and Czechoslovakia, Mussolini in Ethiopia, Tojo in China, Lenin in Russia, Stalin in Eastern Europe, etc...
It's like what Shakespeare wrote about treason : appeasement never fails, because when it fails none dare call it appeasement...
Lord Chamberlain of Peace in Our Time fame is deeply proud of all appeasers.