I think it is just another way to get "detatchment". I needed raging anger to get mine, you are getting yours with a dose of something sadder.
But in the long run, my daughter's addiction and your son's addiction and their subsequent recovery.... is none of our business.
I am glad to see you are able to NOT think about that part so much.
My daughter has said that I used to only see the addict... today, I see more.
I wish you well.