Christ coming became, in a way, a tragedy: The Author of Life came, and humanity killed him. That's a tragedy.
But the death of Christ is also a diagnosis: How do Humans treat God? What is the diagnosis of Human Being? When he comes, the World did not know him. His own did not accept him.
I think that's why God rarely turns up to your doorstep, and knocks. (Like a desperate Presidential candidate.) He knows that this is no guarantee that you'll drop everything and follow anyway. Jesus made a similar point in Luke 16:
Last past to come...
"Abraham replied, 'They have Moses and the Prophets; let them listen to them.' " 'No, father Abraham,' he said, 'but if someone from the dead goes to them, they will repent.'
"He said to him, 'If they do not listen to Moses and the Prophets, they will not be convinced even if someone rises from the dead.' "
Pic on Flickr by That Other Guy