I think there is a need for "censorship" (if you want to call it that), but not for the reason the other people replying to this comment say. Do you really wan

I think there is a need for "censorship" (if you want to call it that), but not for the reason the other people replying to this comment say. Do you really want to censor racist comments, for instance? Wouldn't you rather know how many racists there are out there? The real problem is possible use of a channel like this to support bad actions, not bad viewpoints. For example, someone could advertise to hire a hit-man to kill someone. Or a group might use the channel to organize a mob to go around burning down jewish businesses. In the scheme described, owners of individual servers could block such messages, if they recognize they're there (a possibly hard problem). Perhaps this would be sufficient, while still leaving viewpoints uncensored, since there are, we hope, very few people in favour of serious criminal activity, while many favour free speech even for those they detest.