The thing is I don't think they fear death. 72 Virgins and all that jazz.
People who go to this extreme are not worried about anything because they are so certain in their righteousness. Or they are just crazy. How do you put in any sort of reasoning. These guys accepted that they were going to die. Or so it seems, they had to have made some peace with that.
I am fine with the death penalty, I am fine with violence when required.
But let us think through the right steps.
If the punishment was the killing or imprisonment of their family members along with them, then I think the pressure to behave is there. Or something like that. But now that is a whole set of other issues.
But think about how many guys on RVF that say they don't give a fuck, they say they are alpha and all that. You think, (based on talk of course, I don't know how legit the claims of some RVF members are) that they will be held back by the fear of death when they think they got their shit together because they are such badasses?
Just giving the kid a trial probably got some new fans of this nonsense. Nothing is black and white in this matter.
The US didn't bury OBL in a cemetery, they dumped the body in the ocean to avoid having people go and visit his grave.