Since the merits to making anonymous public arguments are so obvious, that line is one in particular that stands out as defensive. It also confirms one of the points made in the original letter, that people are afraid to speak out. Is there any doubt that the author of the above quotation is someone to be feared?

For a good example of a case where public anonymous argument had far more persuasive power than "engaging fellow executives in a constructive[sic] manner" look at the Federalist Papers, which had a profound effect on the ultimate ratification and subsequent interpretation of the US Constitution.