I truly believe that you can never prevent an accident, thats why its called an accident, otherwise its intentional, true this never should have happened. But tragedies happen everyday to good people. you could be the safest person in the world and make one split second decision, unfortunately that mistake took a life, his fiancees life. accidents happen, i just hope that one day he will be forgiven. The pain he will endure from this is far greater than any punishment by law.