Oh boy, you really made me happy! You have no idea how grateful I feel for learning the word "defensible". English is not my native language, and this precious piece of vocabulary managed to escape my attention so far. For months I was looking for an adjective that fits my opinion on Mr. Polk's conduct better than "appropriate on the whole". "Defensible" is the word that fits exactly. Thanks a lot for making me revel in the joy of "heureka!". It's one of the greatest feelings that I know.