Just so people don't think I'm overreacting: there are two reasons why a false invocation of such a power makes someone a pariah, in my view. Not only does it slander the accused, of course, but it makes the system less trustworthy for HONEST accusations of RL transgressions. In other words, it harms an innocent person immediately, and many others down the line.
We would have to amend Article 5 Paragraph 9. At the very least, this should be added to the immediate ban offenses, with a suggestion that the term of the ban upon review be 10 years or more (certainly life in Web terms).