Many of the Islamic State's ranks have international origins and are recruited online. Notably, many of these young recruits feel disconnected to Islam, especially as many are second-generation immigrants and do not speak Arabic. Many potential recruits come across online videos that detail atrocities committed in Syria, glorify violent jihad, and are requested to join the fight with recruiters framing the conflict as a fight to defend Islam as a whole. Pushed further by anti-Islamic right-wing extremist organizations, many of these recruits feel that Islam is under attack and are theologically compelled to join ISIS.
The term "'jihad" translates to "to struggle" and is its original meaning is not centered around the use of violence. The Islamic State's theological doctrine and the act of joining ISIS in the name of Islam is against most mainstream Islamic scholarship. Therefore, fighters are being recruited either due to an ignorance of Islam or personal motivations.
[P1] Muslims would feel compelled to use violence in the name of defending Islam.
Rejecting the premises
[Rejecting P1] Many Muslims would seek to defend Islam only through non-violent means, considering the use of violence as counterproductive.