NAIROBI, Kenya ? The heavily armed Somali men roused the sleeping quarry workers in the dead of night. As in previous such attacks, the gunmen singled out the non-Muslims by asking them to recite the Islamic creed. Then they killed 36 of them ? most with a gunshot to the back of the head, according to a survivor who hid nearby during the slaughter. The Islamic militant group al-Shabab claimed responsibility for the methodical massacre in northern Kenya early Tuesday ? 10 days after a similar attack on a bus that killed 28 ? and it prompted President Uhuru Kenyatta to shake up his national security team amid public outrage over the continuing violence. I know we are all under a lot of...