Maybe this could apply to people hell banned from communities. Instead of a regular hellban, have a hellban community... Let all of the rolls play together.
Of course there were people who didn't know the convention, and would violate this rule of netiquette. So a mischievous hacker who got sick of all the people asking "please remove me" set up a special mailing list called "please-remove-me@mit-mc" just for them, to which he subscribed people who didn't know the convention, so they could all talk to each other about how to remove themselves from mailing lists.
http://www.codinghorror.com/blog/2011/06/suspension-ban-or-h...
(There is one additional form of hellbanning that I feel compelled to mention because it is particularly cruel – when hellbanned users can see only themselves and other hellbanned users. Brrr. I'm pretty sure Dante wrote a chapter about that, somewhere.)
A lot of them are just trolls/spammers , however there are a number that I feel sorry for because they post relevant and sometimes long comments on threads and I imagine that they wonder why they are not getting any votes or replies.
I think it's easy to get off to a bad start on an online community simply because you don't understand it's ethos rather than outright malice.
* The test for a comment being auto-killed (marked [dead]) is "(or (ignored user) (< (karma user) comment-threshold*))"
* comment-threshold* = -20
* Karma is still updated on item authors if their post is dead - as long as the tests on the person doing the voting pass.
* Once you have the ignore flag set, only administrators can remove it - it is independent of karma.
* You get the ignore flag set for posting a link to a banned site, posting a comment containing banned text, or if one of your posts is blasted or nuked by an administrator.The rationale is that trolls and spammers will usually register new accounts upon being notified of a ban, but a hellbanned troll/spammer might continue to use the hellbanned account without realizing that their posts are ignored.