[carapace]

FWIW, it doesn't sound insane to me that you should have "legal responsibility for any illegal content that gets posted on my forum by third parties without my prior knowledge or consent." You're the one who chose to set your forum up that way, eh? (We're not talking about hackers defacing your site, yeah?)

As much as I find the idea of "illegal content" galling (I love freedom) I'm not so idealistic that I fail to recognize that freedom of speech cannot be an absolute. ("Fire" in theaters; revealing national security secrets; doxxing; there are limits. I'm glad I'm not on the hot seat when it comes to nailing them down: I don't run open internet forums, for example.)

If you don't have a way to pass that responsibility onto the actual speakers then you must shoulder it yourself, no?

Whether or not current systems can survive that is less important to me than the establishment of formal responsibility for one's speech.