TEL AVIV, Israel — The crisis in the Middle East is a knotty test of our humanity, asking how to respond to a grotesque provocation for which there is no good remedy. And in this test, we in the West are not doing well. The acceptance of large-scale bombing of the Gaza Strip and of a ground invasion likely to begin soon suggests that Palestinian children are lesser victims, devalued by their association with Hamas and its history of terrorism. Consider that more than 1,500 children in Gaza have been killed, according to the Gaza Ministry of Health, and around...