There a many different reasons (some good, some bad) why a person gets involved with the Watchtower. Also at a local level there were some decent elders, COs and DOs around, plus some very fine women. You could tell them by the way they acted.
(Galatians 5:22-23) . . .On the other hand, the fruitage of the spirit is love, joy, peace, long-suffering, kindness, goodness, faith, 23 mildness, self-control. Against such things there is no law. . .
Many have now died or been thrown out or are being thrown out right now. But while they were there, some congregations had a strong Christian influence and I joined such a congregation.
Watchtower doctrine is a con-trick, a man-trap for Christians and I think it exists in order to destroy a peron's faith in the True God by craftily mixing scriptures with WT's bamboozling rubbish. If you don't know the Bible well enough to untangle the garbage from the Truth expressed by Jesus Christ, it is easy to get confused. Given Watchtower does this horrible and crafty con-trick, I don't think it's the person's fault if they get conned.
But once you understand it's a con, then you have to get out, fade or whatever you can (according to your circumstances). Ideally get out. But if you don't care that it's a con-trick and you go along with it, then you are showing contempt for your fellow man and contempt for God.
There is a horrible experiment where people administer an electric shock to another. The psychoanalysts measure the point someone will turn the dial up to to hurt their fellow man. Some are so heartless towards the other person (who is shown as suffering) they keep turning the dial up if told to. I guess any guilt they feel for making the other person suffer is off-loaded by thinking, "I have been told to do this."
Watchtower fulfills the role of giving the orders.
Contrariwise, Jesus Christ advises this course of action which if sounded down into a receptive heart would prevent someone from turning up the dial in the experiment and therefore render them useless to the Watchtower.
(Matthew 6:14-15) . . .“For if YOU forgive men their trespasses, YOUR heavenly Father will also forgive YOU; 15 whereas if YOU do not forgive men their trespasses, neither will YOUR Father forgive YOUR trespasses. . .