It doesn't do any good to argue facts with WAS. They've made up their mind despite the negativity.
Articles such as the one referred to earlier spell it out. (I had even once sent that one to WAW.)
or this:
"Happiness Levels After Divorce Decrease And May Never Completely Rebound"
"...A person's happiness level drops as she or he approaches divorce and gradually rebounds over time. But the level of satisfaction does not return to baseline (the level of satisfaction felt prior to the divorce.)..."
Emotionally it's hard. Financially it's hard. My WAW has seen plenty of family and friends go through awful divorces. But still they walk.
Personally I'm just not sure it does any good to try to figure out what's in their head. Wasted effort. Maybe they will come around - maybe they won't. Keep your mind on your own game.
"My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand." Thich Nhat Hanh