Critical Theory is a methodology of critiquing power relations within society. It takes as axiomatic the new-Marxist analysis of oppressor-oppressed dynamics being inherent in all human relationships. As such, Critical Theory is not about whether such power dynamics exist, but in what ways they manifest. There is little talk about why these dynamics manifest.
Human nature, as I define it, is the set of cognitive and behavioral patterns that are innate in human beings, regardless of culture and specific upbringing. These are patterns passed down to us by evolution. With humans, though, we seem to be unique in our ability for metacognition – thinking about our thinking and our behaviors. Does that give us the ability to change our innate human nature?