It was, just like today, outright racism/classism, where the aristocracy of the UK thought the aristocracy of Germany couldn't possibly do such awful things. It's like the political classes of the UK, US and Australia assuming that the political class of Israel wouldn't commit genocide......would they.....Chamberlain gets a bad rap. He bought time while the country prepare for war
Probabaly not his intention,
Though most of the aristocracy peers royals etc were all for appeasement.
They're a democracy after all......