What these dead children tell us, beyond everything else, is this: Israel believes itself unassailable. There is no doubt that Egypt's complicity, newly explicit, has helped. But Israel has acted with impunity for a long time. Remember the Turkish activists it killed on board the Mavi Marmara as they headed for Gaza? Remember Operation Cast Lead in 2008-09? And how, in 2012, the world was shocked when the four children of the Dalou family were killed in Gaza? In the last week, the United Nations noted that a child is killed every hour in Gaza, on average.