There are lots of questions presented, however I do not see an answer the simple question of should it be censored?
You have legal options against whom? An anonymous internet troll using a VPN in China or InterMat? How does the InterMat staff not know it's true, we certainly can't vet everything posted on here.
It sounds as if you want some standards of decency and not to have false information posted on here, but doesn't that create less freedom by restricting your speech? You can't have your cake and eat it too.
Here is another example that might affect multiple people on here. Say there is a health emergency and a respected poster claims his cousin who is a doctor told him to drink 8oz of bleach and it will cure it. He even claims he did it. Then you suggest it to your spouse and they die. Would you want that censored or are we just going to weed out the idiots who believe that stuff?
Everyone of these examples can be extrapolated to X, Facebook, and any other way bigger platform.
In summary, as I stated earlier, everyone wants Freedom of Speech until it affects them personally.