I can only come to one of two conclusions about this. Either, there is a "holier than you maggots crawling around under the rocks" group think that permeates the headquarters and the people who do the writing get inculcated in this attitude. Or, and this is what I think is really the case, the WTBTS is under the control of demons. Because if you wanted to see what the inspired writings of demons would sound like, just read the WT. Now, I don't really believe in the bible's description of angels and demons, heaven, and hell. But, I do know that there are beings out there that are malevolent. What they are exactly I don't know, but I know they exist.
Hang on, I wouldn't jump to deeeemunz just yet. Your first idea seems plausible. In fact, I take your idea and simplify it even further--there's a style manual and all writing must conform to it. I think it would also be possible to train a group of "healthful words" ( ) proofreaders to make sure that everything sounds culty.