The people posting this stuff won't be posting to the BBC. They will be posting to far away places each with their own moderators. They'll either get suppressed at the source, by those moderators, as complaints come in (which they will probably do quite rapidly); or it will get around that those far away places don't moderate, and the far away places will get silenced and blocked and make it onto the aforementioned lists, meaning that the (civilized) world won't pull any posts from them.
The reporting system, bear in mind, reports to the origin server, which won't be the BBC. If I, for example, see an unacceptable post in reply to something posted by the BBC, my report doesn't get seen by anyone at the BBC. It gets seen by my local sysop and the sysop of the origin node.
