Resentment?

I wonder how significant is the sense of resentment in all the troubles we find in the Episcopal Church and Anglicanism these days? If it is, what is the cause of the feelings of resentment? What can be done to change the situation?
James Alison, theologian, writes,

“Yet it was in the midst of these experiences that Joseph developed an awareness of being loved such that he recognized that none of the people against whom he might justly feel resentment were really worthy of his dedicating to them that weight of emotional involvement. And he moved beyond even that, to a position of such freedom that he began to be able to plot not vengeance, but sustained forgiveness as the gift of humanizing others.”
(From Faith beyond resentment, p. x)

Then, if resentment is significant, how much does vengeance play in the posturing and threats of schism and the demonizing of others?