If extremists thought they could mobilize Muslim opinion through acts of clarifying violence, they have failed. Across 11 lands in which Pew surveyed Muslims in 2013, a median of only 13 percent had a favorable opinion of Al Qaeda.

In his 2011 book, “The Missing Martyrs,” Charles Kurzman showed that fewer than one in every 100,000 Muslims had become an Islamist terrorist in the years since 9/11. The vast majority rejected the enterprise.

When political Islamists tried to establish theocratically influenced rule in actual nations, their movement’s reputation was badly hurt. In one of extremism’s most violent, radical manifestations, the Islamic State’s caliphate in Iraq and Syria became a blood-drenched nightmare.

But even in more moderate places, political Islam is losing favor. In 2019, The Economist surveyed the data and concluded, “Across the Arab world people are turning against religious political parties and the clerics who helped bring them to power. Many appear to be giving up on Islam, too.” Ayatollah Mohammad-Taqi Mesbah Yazdi of Iran noticed the trend in his own country: “Iranians are evading religious teachings and turning to secularism.”