Everyone is posting their thoughts. That's what the disclamer says.
I'm not advocating slash and burning other thoughts. Heck, you'd probably get banned, but thoughts are the opinions of the posters. This is a member conversation. If you wish to join in, it's your option. If you don't like the thoughts and opinions posted, don't read them. You come here volentarily. It's private - for members only.
Ok, I'm not even entirely sure what you're saying, and correct me if I'm wrong, but I understand you to be saying that every single post on FR is opinion, and thus not subject to a defamation lawsuit. That couldn't be more wrong.
Suppose you were to post something to the effect of "I saw Bill Clinton shoot 15 old ladies yesterday." You would be making an assertion of fact, not an opinion. Clinton could then (sadly) sue you for defamation. Suppose it got picked up by Fox news and reported as "FR poster 'concerned about politics' reported on the FR website today that he saw Bill Clinton shoot 15 old ladies yesterday." They would be reporting that you made an assertion of fact. The disclaimer about everyone's opinions being their own will not save you. Do you get it now.