We can argue back and forth about Munich, but I still think that it's entirely possible that Chamberlain knew exactly what he was doing and was prepared to sacrifice his place in history to buy us (just enough) time to build up a viable defence against German aggression.
In fact The History Channel says this: "While the Munich Pact would become synonymous with “appeasement,” some historians believe that since the German and Italian air forces were twice as strong as the combined British and French airpower in September 1938, Chamberlain’s agreement gave the British military valuable time to bolster its defenses to ultimately defeat Hitler."
Not that this necessarily has any bearing on today's situation