Cobra, all I'm saying is that you cannot MAKE anyone change.
I can leave the room when you drink and that might make you reevaluate your choices, granted... but I cannot MAKE you stop drinking.
The problem with the POV you espouse (excuse the expression) is that one winds up focusing too much time on watching the reactions of the other person and not enough time cultivating one's own garden. And one's OWN garden is where one lives one's life.
The other part of the serenity prayer says "to change the things I can." The serenity prayer is not about settling for stuff, putting up with abuse, or giving up. It's about putting the lever in the right place to make The Thing move that needs moving IF IT CAN BE MOVED.