The Second Letter in Utopia

So we pretty much all agree that Book II of Utopia is pretty interesting and raises some interesting and controversial questions. But what about the very brief second letter to Peter Giles at the end? The footnote states that it wasn't included in the first edition of Utopia - so why bother to include it in subsequent printings? At first it seems to be some type of rebuttal concerning the authenticity of Hythloday's story. But More doesn't directly state whether or not he believes the story to be true; he simply tells Peter that anyone who wants to know the truth should ask Hythloday himself and even points them in his direction.

This tiny letter was perhaps the most difficult part to understand of Utopia. I get the irony in it, but is it simply a reaction to criticism that More received after the first printing? It just seems to be a bit random within the book. But it is slightly humorous. He states that "reading the book all the way through" is a "burden" (589). I'm sure several of us can't help but agree (although I was surprised that it was so interesting and timeless).