I'm not quite clear as to whether the owner of the crashed airplane tried to lay a guilt trip on you or whether you are taking it on yourself. You had only two choices when he asked for your help: 1) do what you did and hope he could fly the plane to a successful landing and everybody feels good, or 2) refuse to help and possibly be considered a real jerk. He was gonna fly it anyway and probably crash it whether you helped or not. Whether you are a recognized instructor or not is of no importance. A guy brings a plane to the field to fly, he has to accept the idea that nobody is gonna do anything to deliberately contribute to his crashing. And he has to accept the concept before hand that if he asks someone to help him, that someone is going to do his best to help That is simply the nature of our hobby. Everyone In the hobby tries to help and wants the newbie to be successful. The more people who are successul in our hobby, the better off we all are. A man asking for help (instruction)has to assume the helper (instructor)is not responsible for whatever happens. A guy brings his plane to the field, asks for help, the airplane ends up crashed, it's on the shoulders of the owner. Period. As soneone mentioned earlier, we start holding a helper or instructor responsible for a poor outcome, nobody is going to be willing to help. At that point, this hobby is doomed.