As I've said before, I have personally never really looked into this matter, but I just Googled it, and came across a page that should cover most of what the view of 'apostates' are: http://www.randytv.com/secret/unitednations.htm ("disclaimer": I don't necessarily agree with everything there; I haven't read it all)
I think it's funny how they try to spin this around, though. The Watchtower are the ones who have always drilled into us how bad the UN is, and now suddenly (mostly in the comments by the other JWs, though), the 'apostates' are lambasted for claiming that the JW view of the UN is that it's evil!
-Maybe John should have included something about the scarlet beast actually feeding and otherwise helping small children around it, but them dying anyway? That would kinda have fit into how the beast of UN is evil, but at the same time does good deeds (albeit unsuccessful in the long run according to JWs).
One question remains though; why did they choose to disassociate themselves with the UN just after this was revealed? Actually, that question doesn't remain come to think of it, because it's answered in this letter: they did so because the news was revealed, and they didn't want anyone to think wrongly about their association with the UN.
Well - if there was absolutelynothing wrong or "dubious" or noteworthy about their "membership" (library card access?), then why not simply remain a UN NGO (DPI), and use the Watchtower to - in an article - explain all the things laid out in the letter above? That way they would have officially shown how they were not wrong, and how this all works, and how/why they could continue being a UN NGO. The above letter after all explains how it was all OK in the first place.
All this said, I think I should add that - in general, not necessarily pertaining to this case - as "apostates", it's very important that everything we say or 'reveal' is the absolute truth and current fact, and that we have proof to back it up (not saying we don't here). For instance, I've seen 'apostates' argue with active Witnesses that they sell their literature when they go door-to-door, and this ended a long time ago, at least where I live. Indirectly they may still 'sell' them, but only through contributions. It's important to have the current facts.