IN 2014, Abdul Rochim tried to convince Abu Bakar Ba’asyir not to trust information on the Islamic State in Iraq and Syria (ISIS). Rochim told his father, who was serving his sentence at the Nusakambangan Penitentiary in Cilacap, Central Java, that ISIS was violently murdering fellow Muslims, such as by slitting their throats.

But instead of listening to his son, Ba’syir believed that ISIS was an organization that upheld Islam. &ldqu