Sentence:  Of all the foreigners I have met in this country, diplomats, business men, and archaeologists of many nationalities and varying terms of residence, Christopher is the only one who likes its inhabitants, sympathizes with their nationalist growing-pains, and consistently upholds their virtues, sometimes to the point of <WSD>unreason</WSD>. 
Meaning of the word marked with <WSD> tags:  Lack of reason or rationality; unreasonableness; irrationality.