If the moderation was useful it would filter the personal attacks as they are an attempt to censor or can be presumed to be such. And of course it would filter spam of which the personal attack certainly is spam.
If it were me, I’d ban retroactively on this basis. If I noticed the same email associated with a nic and personal attacks start back up I’d ban the email. Just say: sorry this is being done retroactively but after consideration we’ve decided its necessary.
Take the suggestion for an unmoderated no nic anonymous section of the site seriously. Posts in this section wouldn’t post to the main site. Nor would they track nics within threads as in anon 1, anon2, anon 1. It would just be anon. This approach is useful as it keeps idiots from attacking posters and keeps the focus on ideas. It would still have the potential, possibly to increase useful contributions to the site.
People I am sure use the site for social networking and have used the site to build identities to which they are attached. But in way that defeats the utility of a forum. Ideas are not considered on their merits but on the basis of associated personality. Ironically this seems to be at the heart of what MaidSafe is attempting to overcome- force of charisma and money driving everything.