I like the approach you have given to this. So, Cain and Abel is a dualism between us and what we want (we should) be. Interestingly, Cain can kill Abel, but it is impossible to happen the other way around. If the murder had not happened, although there is a certain inevitability there, Abel would always have to live with Cain. With everything that implies.

By the way, your posts are truly entertaining and thoughtful, good work, regards!