I'm a little confused about "Storm Fron, Part II" from Season Four. According to Malcolm Reed, divergence from the timeline began when Lenin was murdered in 1916 and his killer "vanished into thin air." Yet, it was the Enterprise's destruction of the Na'kuhl complex's shields in 1944 that reset the timeline back to normal. Why? Wouldn't it have been better if the writers had found a way to prevent Lenin's murder in 1916?