I'm not being flamy, but who cares what their book says if your putative leader is such a fat cowardly dork that he hides in a bunker but urges others to die for him?
I mean, if their spiritual leader said, "I'm Steven Al-Sagal Al-Chucknorris al-Blackbelt, and I'm ready to lead you wonderful jihadis into battle with the infidel, anytime and anywhere! Follow me to victory!", it might be a little easier to understand their suicidal zeal.
Just asking.
These asshats live almost exclusively in 3rd world crapholes without a pot to piss in or a window to throw it out of. Their entire lives consist of slamming their heads into a prayer rug five times a day screaming 'Death To America' and 'Death To Israel' on cue all the while wiping the excrement from their stinking backsides with their left hands.
After a couple of decades of this, their parents drop some toothless, smelly, burkha clad wench on them and say 'here's your wife'.
Then it's back to slamming their heads into the rug five times a day, more 'Death To Everybody' bullsh**, and maybe if they're lucky few scraps of rancid goat meat for dinner.
A couple of decades of that crap will make anyone squirrelly enough to follow whatever hucksters promise them 72 virgins and everlasting beer and chips in paradise.
That's my take on it.
L