I think this "take the time to validate the waywards" stuff is a bit lopsided... My older brother was a drama queen so maybe I am biased... But It's been my experience that just because someone acts out more, blames more, and complains more doens't mean they are hurting any more than the one who's remaining calm and collected...
So why does the ABANDONED spouse have to do all this validation nonsense?
I think you are asking these LBS spouses to do no less than humiliate themselves... And that's not worth any marriage... Not even if she's Uma Thurman! lol