Rereading of their holy book is not going to change what's formed in them due to the culture which they have been exposed to their whole lives. I agree with yo

Rereading of their holy book is not going to change what's formed in them due to the culture which they have been exposed to their whole lives. I agree with you that culture is hugely important in determining what a person considers to be justifiable killing. I don't agree that re-reading their holy scripture can not change their attitude. People have life-changing religious experiences all the time. One reformed murderer comes to mind who actually went on to write a large chunk of Christian scripture.