Tiger Woods should have withdrawn from the 2013 Masters.
Yes, it was more than he had to do, because the rules state that he was able to finish out the tournament, but withdrawing would have been the right thing to do.
On Saturday morning I got to my club as I do for most Saturday mornings for breakfast with my regular group. By that time ESPN and Golf Channel had already been talking about the drop. One of my good friends came in and I told him of the ruling and he immediately said that when he was watching the event he had told his wife after Tiger made the drop that it was not a correct drop. Sadly I did not get to see it live that day because I was working but I certainly saw the replay on all of the sports channels.