After barely escaping a creeper explosion with his life, Steve goes wildly insane. He turns to obsessive griefing, and tattoos creeper symbols on his body. He straps TNT to himself, and sets to work on the server.
Houses burn, castles fall, and diamonds are torched away. The admins search, but they never discover the griefer. The server eventually closes, and Steve moves on. What is his next target, I wonder.