When Arabs kill Jews, the usual explanation is that the murderers are fighting back against Israeli occupation. But that doesn't explain Hesham Mohamed Hadayet, the 41-year-old gunman who killed two people at an El Al ticket counter in Los Angeles on July 4. Hadayet had been living in the United States for a decade. And he came from Egypt, a country that signed a peace treaty with Israel two decades ago. Israel gave back every square inch of the Sinai back in 1978, and it doesn't occupy any part of Los Angeles County. So what pushed Hadayet over the edge?...