"The fact is, these ones have shown that in reality, their love for us was never REAL or GENUINE. No, those relationships were superficial and lacking in substance."
I beg to differ. Your words do have a certain "ring of truth" to them. But then again many have also said that the false JW teachings have "the ring of truth".
I don't think it's always the case of them not having genuine or real love. I'm sure many of them are also pained by the fact that they can no longer speak to the shunned but they do it because they have been brainwashed into believing that shunning you is the right thing to do to save your life. They have been brainwashed into showing love in a cruel way. It's an extreme example of mistaken love.
It's not much different to a parent who would subject their fatally ill child to a painful ordeal if they're convinced that it is necessary to save the child's life. Does such a parent lack real or genuine love for their child? No. The only difference between such a parent and many brainwashed JWs that practice shunning is that the parent's actions might be justified by medical science while the JWs actions is woefully misguided and based on error. In both cases genuine love could be present.
You cannot judge love or lack of love purely on actions. You have to consider the motives. A person can kill you out of genuine love for you and kiss you out of pure hate. I'm sure many ex-JWs on here will testify to the fact that they too engaged in the practice of shunning ex-JWs when they were indoctrinated Witnesses, not because they didn't love them but because they thought it was the best thing to help the "erring" one to return and avoid destruction. I'm sure many JWs are probably torn inside.
It is not necessarily the lack of love. It is most certainly the power of indoctrination.