Henri McPhee
Illuminator
Chamberlain was terminally ill at Munich. That does affect one's ability to negotiate effectively.
I don't know much about Chamberlain's medical condition in 1938. I have always been under the impression that he died fairly suddenly, or a few weeks and months, of stomach cancer, which is not the same as something like senile dementia, and it does not affect judgement. He did make the remark when he was alive that it would have been far worse if Britain had gone to war in 1938, which was right judgement.
I still think these wars and battles and complete victories are not an easy task, as Churchill seemed to think. Even Wellington made similar remarks about his battles with Napoleon as being a damned close run thing. The Americans found out that landings were not easy.
There is a fair and just account about Chamberlain at:
www.bbc.co.uk/history/ww2peopleswar/stories/97/a6655197.shtml