You've probably heard sentences that stuck with you. Quotes, one-liners. You hear them and they make so much sense or touch you so personally at the time that they become part of you. When I was first coming out of the bOrg, I read (on this board) "I'd rather have questions I can't answer, than answers I can't question." Powerful. I couldn't forget it if I wanted to.
Once a JW (perhaps a friend from your past) realizes you've "turned apostate", they are going to run away with their hands over their ears yelling "blah blah blah", so you don't have time for a nice, protracted discussion of the UN/NGO scandal. And whatever you say, it has to be more on the lines of planting a seed rather than presenting some evidence.
So I put it to you, what one sentence could you say to a JW that would gnaw at them after they left?
Dave