Of course the problem with the accident was strip management. Only one aircraft in the frequency, and you forget about the vehicles on the runway!!! That means that either you don't have a procedure about strip management (and you don't have, because you are crying for help), either you don't know how to move the strips on the board, or you didn't follow the procedure (RCASTA states very clearly that you have to use a strip for vehicles on the runway during low visibility operations). Strange is that we have only one God when dirty things happens to you. When it comes to share the cheese, your God is greater than the God who protects controllers from the other airports in Romania. Be humble, swallow the bitter pill, learn the lesson and carry on.