I doubt the person who owns this zone even plays now
I don't agree with sealing someone in...but seriously? SEAL YOUR GOD DAMN POSTS ONCE YOUR DONE WITH THEM.
I mean. its not -as- bad with brick walls, despite the fact they require ram rather then just ram or high strength, because it takes a dedicated griefer to go and produce the clay bricks required to grief. Palisades however, simply require wood blocks as we all know, so very easy to grief the hell out of anyone foolish enough not to seal their palisades once they are finished with them.
even if your cornerposts ARE protected by a personal claim, It's not overly hard to grind up for vandalism via buckets, and to then grief.