Having her kill her parents, just like having them sell her to protect her, is an idea that’s good, but not as good as the alternative. I prefer the idea that it really did seem possible they might come back and she had to slowly come to terms with it.
Yeah but she already came to terms with that in TLJ which leaves us with very few options for her internal conflict in TROS. I think throwing some dirt on Rey’s “squeaky clean” image by making her the one that killed her parents would go along way.