It's not a simple situation. I have faded pretty far out but i still associate with witnesses I really like and I love those people. If and when they speak of religion I am silent. In trying to tell an active witness about the real truth of what they believe, you typically will accomplish little more than causing them to put up the cult shields and go deeper in.
In their mind they have been conditioned to put you into a lose lose situation. yes the cult ruins lives, but to reference the Matrix, why didn't they just wake everyone up? In the movie they said it was too much for them. Some of us are in position of outright activism, and some of us in a much more subtle and organic way.
I refuse to speak to a JW about anything religious unless I feel they are genuinely ready to open their mind, and most just aren't yet. But when they are their are good people that need someone to show them the way out.
Shattering their dreams is good, most of us had to do it to ourselves, but how you do it and when makes the difference of driving them further in or helping them out.