8. If you are unhappy...
Property rights being what they are, there is no higher authority on Netnews than the people who own the machines on which Netnews traffic is carried. If the owner of the machine you use says, "We will not carry alt.whips-and-chains on this machine," and you are not happy with that order, you have no Netnews recourse. What can we outsiders do, after all?
That doesn't mean you are without options. Depending on the nature of your site, you may have some internal political recourse. Or you might find external pressure helpful. Or, with a minimal investment, you can get a feed of your own from somewhere else. Computers capable of taking Netnews feeds are now quite affordable, and there are several free Unix-like operating systems (NetBSD, FreeBSD, 386BSD and Linux from ftp sites all around the world, complete with source code and all the software needed to run a Netnews site).
No matter what, though, appealing to "Netnews" won't help. Even if those who read such an appeal are sympathetic to your cause, they will almost certainly have even less influence at your site than you do.
By the same token, if you don't like what some user at another site is doing, only the administrator and owner of that site have any authority to do anything about it. Persuade them that the user in question is a problem for them, and they might do something -- if they feel like it, that is.