Interesting points. I'll say a few of my thoughts on the subject...
When I read the first and second sentences of your argument I was immediately struck. I like to think that people are generally truthful. Then I thought about it a little. While I like to think that I tell the truth in general, there are countless times every day when I choose to stress one part of a story or gloss over something that may be important. Some things I have said enough times that I start to believe them. Why do I lie? Maybe to be funny or joke about someone. Maybe I don't want someone to know something. But what is consistent is that they are all minor. Lies slip in to conversation without our even noticing. So I'll change what you said to match my beliefs: It is not courageous to speak what is true on any one subject, if randomly chosen. It is courageous to tell the truth all the time
. But, in any case, would we want a society where everyone only says the truth?
Two thumbs up for "boorish frauds," though.