Had I been on the jury, it would have been hard for me to NOT apply the death penalty to these killers.
On the other hand, if they truly believe that dying for the cause gets them to heaven, maybe a life sentence is more severe punishment? Of course, as a prisoner, there is always a chance that a killer might escape or kill a guard.
With apologies to any devout peace-loving Muslims, is there any chance we could feed these prisoners bacon at breakfast, ham sandwich for lunch, and a pork chop for dinner? Probably not.
And there's always a chance that they'll get their butts kicked every day for the next 50 years by their fellow inmates. (look at the bright side!)