Soccer goalkeeper should move randomly

Soccer goalkeeper or goalie should move in an unpredictable way left and right during the penalty, instead of staying in a fixed position as generally practiced. The random movement of the goalkeeper not only interferes with the focus of the penalty shooter, but more importantly, disrupts any of his plans to shoot at a predetermined position of the goal. As to the goalkeeper, most of the time his catch of the ball is by accident anyway. So there's nothing for him to lose.