This may be a matter of how we interpret that moment in history. The opinion you quote seems to imply that Chamberlain’s decision to sign the 1938 Munich Agreement with Hitler was an insincere one ie that he really did not believe that he had found a way to peace but that it could not accept the personal and political embarrassment of admitting he had been wrong. My understanding of this event is that he was sincere but tragically so. He so wanted to avoid war that he evaded the full context of what he was dealing with – the nature of the Nazi regime and its track record in the 1930s of using force to achieve its aims. If he had chosen to consider the full context he would not have signed the agreement and certainly would not have tried to reassure the British people that he had found a way for peace with Germany. A similar case now is when some call for a peace agreement between Israel and Hamas. Such a call fails to take into account the full context of what Hamas is and its aims.