Many thanks for the responses to my query about the age of players. I have only played Resident Evil 4 and 5 before, starting after age 70. The difference between those games and RDR2 is the moral element of the latter - it is definitely different killing zombies or multi-headed monsters. I am so emersed in RDR2 that all my emotions are engaged - guilt, shame, (collecting debts from the likes of the Downes family) embarrassment (at my incompetence) and joy and wonder at the wilderness and wildlife. I am an atheist but it seems to me that the AI acts as a kind of Creator with an ethical agenda non-existent in the non-gaming world.
The minor key music that swells up after particularly emotional moments swallows me up at times. And always after I have committed some atrocity accidentally - punching my beloved horse, shooting a woman I meant to help home, arresting a man who pleaded for forgiveness and redemption because I didn't know what else to do to progress, and because the function of some buttons mysteriously changes. There are many lessons for life in this 'game' that is not a game at all but a very real part of my life and search for my own redemption.