My complaints are interpretations of facts, not facts themselves.
When I complain, I often feel justified in my complaining because I think my complaint itself is the facts (not simply an interpretation).
But if I am only going after feeling justified, where does that get me? Typically this just gets me the result I already have rather than something new.
Newness comes from accepting my complaint as my experience of reality and then creating a new way of interpreting the facts.