Tybee, some people who have post here could be confronted with an ugly reality check. For, in some posts, more than opinions are being expressed. Moreover, as has been noted in a separate thread, the Jon Benet case and this forum are operating under different standards than the rest of websleuth's forums. However, legal standards for libel remain unchanged.
People who post that one or more of the Ramseys killed or murdered JonBenet are exposed to a defamation lawsuit. Likewise, if people post that one or more of the Ramseys sexually assaulted Jon Benet prior to her death, they have that same exposure.
If people post that they "know" or otherwise state that one or more of Ramseys are responsible for Jon Benets murder, they are clearly exposed. The same holds if people post that they "know" or otherwise state that one or more of the Ramseys sexually assaulted Jon Benet.
Using the word "know" represents certitude, it does not represent opinion. Words such as feel, think and believe represent opinion. And if people say they "know" or otherwise use words that express certitude that one or more of the Ramseys committed a crime, they are exposed to a defamation suit even if they say all of their posts represent opinion.
Developing an ambiguity should not be thought of as protection from a libel lawsuit, for courts resolve ambiguities against the maker of the ambiguity.