If you weren't allowed to express "negative" opinions, I would have been banned a long time ago.
Jarmo isn't stupid. He has always allowed his members to discuss topics in any way they prefer and to feel like they have the right to do so without worrying about being outcasts or being banned. I think it is even easier now, because the karma system ensures that you can say how you feel without worrying about being constantly insulted and harassed because of your opinions.
We are all GNR fans. We all just have our own opinions and interpretations of what happened, and why. It brings interesting discussions, and helps keep the forum alive. If everyone was on the same page, every thread would just be "I agree" posts.