User blog comment:Meighan/Wiki Wisdom: Reacting to Trolls and Vandalism/@comment-25418284-20111112020015

Another law of dealing with vandalism: give them plenty of warnings. If it's immediately obvious that they're causing large amounts of damage for no acceptable reason, block them and move on, but if they're doing test edits in the wrong places or committing other more subtle acts of vandalism, always drop them a polite note or two explaining that what they're doing is wrong. If they stop and apologize, undo their damage and forgive them. If they don't, gradually get more stern, give them a final warning, and if they don't stop, let an admin deal with them.