From some of these comments and from personal experience it seems the "brotherly love" seems to be highly conditional. As long as you are willing to be a witness and to follow their doctrine you will have all the so called love you need. Reminds me of Matthew 5 "Love your enemies". Whats the value of loving only those that agree with your worldview?
One of the main issues is that to keep control of people you need to limit their exposure to information that shines light on your lies. Jehovah's Witnesses do this extremely well. They make you feel that any non GB information is satanic influence. They make you feel that any doubt in GB is satanic influence. They make you feel that any apostate ex members are satanic influence. Once these things are entrenched in you, your own conscience does the rest of the work keeping you in line. I've had a family member literally running from my house when I started sharing "worldly" information.....sad!
John 3:19 And this is the verdict: The Light has come into the world, but men loved darkness more than light, because their deeds were evil. 20 Everyone who does evil hates the Light, and does not come into the Light for fear that his deeds will be exposed. 21But whoever practices the truth comes into the Light, so that it may be clearly seen that what he has done has been accomplished in God.”
Seems Jehovah's Witnesses's "Light getting brighter" or "new light" teaching is actually the darkness getting darker!