If it was a phishing link, malware, or something nasty, then I would be in favor of banning the person doing it. Other than that, I don't think the forum and its administration will (or should) take the route of censoring information they don't like. If someone wants to discuss how bad Bitcoin or a piece of software is, let them do it. Point out why they are wrong and what knowledge they are missing or ignore them for your own health.

We have that maniac (fxsurfer, antikvark, whatever the name is) who returns every couple of months and creates a few threads bashing bitcoin, everyone argues with him, and then he disappears, only to come back again some day.