The same reason The Passion of The Christ out sold every other Christ movie by like a billion to one......
It's a horror story.. he didn't just die for us .. he had to suffer too.. so it seem a bit more than a balancing of the scales.. but an instalation of fear..
If it was a life for a life , why couldn't it have been a merciful death? how does the fear and horror balance the scales "better" ..
JW's are not alone in this tale of Horror