I can see both sides of this. On the one hand, I can see Kate's point because some of the particularly hateful comments on here likely delayed my awakening, as it confirmed my indoctrinated sense that apostates are just bitter about some percieved injustice and will say anything to damage JWs. On the other hand, it only delayed my awakening by a couple months...and I think that it's likely that very few will be turned away permantently, because the issues that bring them here in the first place won't go away on their own.
Different strokes for different folks. I think it's likely that many (as is the case for me) are going to be swayed by logical, well thought-out arguments, while others are more likely to be swayed by emotion. Balance is important in all things, and I don't think it's any different here.