The Watchtower quoted earlier in this thread went on to say that the spiritual food provided was at times wrong. This did it for me. February 2017 - "Of course, Jesus did not tell us that his faithful slave would produce perfect spiritual food."
We used to say about False Religion that if a person gave you a glass of water which was 99% safe would you drink it? Because the 1% poison could kill you.
So if the spiritual food that the F&D slave is dishing out is imperfect, then the question is Should I be eating it? And by the same logical argument above, the answer is pretty clear.