Do you know who Chamberlin is
He was the prime minister of UK before Winston Churchill. He refused to stand up to Adolph Hitler and even signed the awful Munich Agreement which paved the way for the Nazi invasion of Switzerland. He also was an isolationist like American pilot Charles Lindbergh.
I'd suggest you read Phillip Roth's seminal work "The Plot Against America" which discusses an alternate history where Lindbergh becomes President of the U.S.
I'd suggest you read something about Chamberlain. He was a sincere man who did what he thought was best under the circumstances. Once war became inevitable he was completely behind Churchill in the war effort (as opposed to thrash like Halifax). It's funny that in the case of Chamberlain treachery is refusal to stand up against a foreign dictator, whereas in the case of Lieberman treachery is standing up against a foreign dictator. Ah, the irony...