You're right- what's alarming is there seem to be so many of them devoted to islam..
bttt
It's their organizing principle...Communism, Islam, Hinduism, and occasionally Christianity have all been used to excuse hate and anger.
And all get people into the belief mode that the ends justify the means.
Post colonialism, conflict of values, local corruption, real injustice and manipulation by religious leaders who have their own agendas are all playing a role here.
Islam is particularly easy to manipulate this way, but the response of hate is buried deep in the human soul.