Instead of expanding on their "evidence," they decide to end the paragraph with a vague rhetorical question about something that they have yet to verify, namely how it is they know they aren't in the same "spiritual darkness" that they are convinced has plagued mankind for "centuries." So the first evidence they offer seems to be a bit of a bust, so moving on.
14 Evidence of angelic assistance. The Governing Body today has the colossal task of overseeing an international preaching work involving over eight million evangelizers. Why has that work been so successful? For one, angels are involved. (Read Revelation 14:6, 7.) In many cases, publishers have called on individuals who had just been praying for help!* The overall growth of the preaching and disciple-making work despite fierce opposition in some lands has likewise been possible only with superhuman assistance.
"It rained once after I did a rain dance that's how I know it must work." That's about the same logic being used in this paragraph. They make the classic of mistake of assuming that a correlation means causation. Firstly, since these supposed angels are invisible and unwilling to testify there is no way to verify their involvement. Secondly, the fact that "many" (a rather vague amount if I do say so myself) cases have a publisher calling upon someone who has just prayed does not prove angelic direction, especially when one takes a moment to consider numbers that are involved. With several million people spending almost two billion hours year (over 5 million man hours a day) then a number of them are bound to come across people who have been praying recently.
The last sentence of the paragraph likewise makes no sense, there have been many unpopular ideas that manage to flourish for a time despite intense opposition from superior forces. ISIS is one that comes to mind, there are many countries right now trying to destroy them, but so far their efforts have failed. Does that mean that ISIS is also receiving "superhuman assistance?"
Onward to the final piece of evidence.
15 Reliance on God’s Word. (Read John 17:17.) Consider what occurred in 1973. The June 1 issue of The Watchtower asked the question: “Do . . . persons who have not broken their addiction to tobacco qualify for baptism?” The answer was: “The Scriptural evidence points to the conclusion that they do not.” After citing several relevant scriptures, The Watchtower explained why an unrepentant smoker should be disfellowshipped. (1 Cor. 5:7; 2 Cor. 7:1) It said: “This represents no effort to act in an arbitrary, dictatorial manner. The strictness really proceeds from God, who expresses himself through his written Word.” Has any other religious organization been willing to rely fully on God’s Word, even when doing so presents a real challenge to some of its members? A recent book on religion in the United States notes: “Christian leaders have regularly revised their teachings to match the beliefs and opinions gaining support among their members and in the larger society.” If those of the Governing Body allow God’s Word rather than popular opinion to guide their decisions, who is really leading God’s people today?
I certainly don't need to tell you people that the Society is by no means the only organization who attempts to make their views fit the Bible, and in the end, this largely comes down to which sections are interpreted literally and which are interpreted figuratively, and which scriptures you tack a mountainous stack of guidelines onto (like the concept of disfellowshipping for example.)
Well, I grow tired of this exercise in critical evaluation and now leave the results to be examined by my peers. As always I welcome your comments and critiques.
P.S. Sorry that this in two posts, I got a weird refresh error in the middle of writing this.