The jihadi movement, by holy militants, is a just war of retaliation against all injustices, one that has been endorsed by religious scholars including Egypt’s Muhammad Abduh (1849–1905), Syria-Egyptian thinker Muhammad Rashid Rida (1865–1935), Iran’s Ruhollah Khomeini (1902–1989), Egypt’s Hassan al-Banna (1906–1949) and Sayyid Qutb (1906–1966),...