" It is a serious matter to represent God and Christ in one way, then find that our understanding of the major teachings and fundamental doctrines of the Scriptures was in error, and then after that, to go back to the very doctrines that, by years of study, we had thoroughly determined to be in error. Christians cannot be vacillating—‘wishy-washy’—about such fundamental teachings. What confidence can one put in the sincerity or judgment of such persons?." ---(Watchtower, May 15, 1976, page 298)
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For once, WT got it right. I followed this advice...that's why I'm no longer a JW.
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And, let's not forget: according to WT's current doctrine, the Faithful slave is literal, the evil slave is only illustrative.
Please ignore that both are discussed in the same verse.