I'm not sure what your point is. I've never made any claim about legal liability. I said that sites that support/encourage/facilitate the things that KF (as a site) does should not be supported. We are under no obligation to define morality based on legality.
Like, your defense here seems to amount to "what they're doing isn't technically illegal", which, sure, but that's not a defense to most people.
Well, the answer to "it's not illegal" is to change the law to define what should be illegal to make it match up with morality better. I conjecture that most such changes would possibly take down FB & Twitter, but I've already said that I don't really think that would be a net loss.
Like, your defense here seems to amount to "what they're doing isn't technically illegal", which, sure, but that's not a defense to most people.