The Society's purpose in quoting is not to convey the truth of a matter, but to bolster its argument of the moment by any and all means at hand. Source references are not used to examine the pros and cons of issues, but to fool readers into thinking that "authorities" support the Society's position. The only thing they're really concerned about getting right is the precise sequence of words between the quotation marks. Whether they misunderstand or misrepresent whoever they're quoting is irrelevant.
The best examples I know of to illustrate dishonest and stupid quoting practices are the Society's books on evolution/creation from 1967 and 1985. I've done an extensive analysis of the latter book, Life: How Did It Get Here? By Evolution or by Creation?, which you can find here http://www.geocities.com/osarsif/index2.htm in the article "The WTS View of Creation and Evolution". I've documented more than 100 misquotes.
A few years ago I found out that the main author and compiler of the 1985 Creation book is one Harry Peloyan, a long time Bethel Writing Staff member who is now the editor-in-chief of Awake! magazine. I went in to Bethel and, after some difficulty, got him to come to the lobby of the main building. We talked for about 45 minutes, mostly about the book. He was fairly hostile and kept threatening to walk away, but for some reason kept on talking. He absolutely refused to discuss any details of misquotes, except for one instance. This is the one where paleontologist Richard Lewontin is misquoted. He wouldn't admit that Lewontin was misrepresented, and asked, "Are the words between the quotation marks correct?" I said Yes. He said, "So what's the problem?" I said, "Alright, suppose that a Watchtower article quoted an evolutionist as saying 'evolution is true'. Would it be fair for me to start claiming that the Society is now teaching that evolution is true?" He looked at me with an evil eye and refused to answer. I said, "I think you understand my point." Peloyan is absolutely typical of Watchtower writers, who think they're above normal standards of honesty in writing.
The Society has been hugely bashed by criticism of the Creator book, so when they came out with the Creator book in 1998, they left out most of the source references. Clearly this was so as to make it much harder for critics to find the misquotes. On a more positive note, I think that this newer book contains far fewer flat-out misquotes than the 1985 book. However, the arguments are much more fuzzy and carefully avoid real details. Unfortunately the typical JW reader is too stupid to realize that the devil is in the details and that the irrelevant verbiage in the book lends no real support to the book's basic thesis.
AlanF