Trying to eradicate anger is like trying to box with our own shadow: It doesn't work. Getting rid of it implies either expressing it and creating untold emotional damage, denying its existence, or repressing it until it erupts at a later time.
It keeps me hopeful that the worst of times will not be in vain if we can just learn from them to ensure they never happen again, and to ensure we continue to do what is needed to help all humans be just that -- human.
There's something troubling about the use of the word "relationship" that excludes all relationships but romantic ones. All other adult relationships aren't just excluded in the wording; they're absent from the studies.