It is my belief that we all reach a "place" that sits well with our own journey.For some it is a book other have an experience that allows personal growth.
I too have read books Eagle similar to the one you mention.

Meeting many people who are troubled through my career there often presents a mindset of turmoil...presents as health problems or inablilty to maintain significant riendships..sometimes manifests as sadness and sometimes anger...in most cases there has to be a turning point before a client finds ther "place"
So for me being vengenful has no value and erodes well being.
It demands practice and is as important as exercise and good food.