You know the old phrase "Those who cannot help themselves help others?"
This is basically the "Hurt" version of that same ideology. Those who are hurt take it out on other people... those who do not wish to grow - but to simply rage at others for their poor real lives. Otherwise known as "bully syndrome".
Their lives suck so much, that they have to take it out on others to make themselves feel less insignificant. They'll lie to you and tell you it's to "inspire interesting battles and events"... which can sometimes be an unintended side-effect... but the reality is the former.