Not the first time the “wrong” engine has been shut down by mistake, and unfortunately it probably won’t be the last either.
However thorough the training, and however experienced the crew, there is always the chance that human error will creep in. At least it seems they did identify their mistake and try to correct it, unfortunately they ran out of time/height/airspeed.
Let’s hope procedures and/or training etc are improved as a result. The accident was a tragedy, but it would be even worse if no good came of it in the longer term…