This website sits at the intersection of Marshall Rosenberg's teaching about Nonviolent Communication and the modern advice column. For now the letters are all "borrowed" from popular advice columns. And the responses are somewhat mechanical attempts to guess about the writer's (and their characters') feelings and needs before veering into occasional suggestions of possibly helpful strategies.
For a primer on Nonviolent Communication, I encourage you to seek out Marshall Rosenberg's book, his audio recordings (available as free podcasts currently), and the website nvc.org.