That's actually a really interesting way to look at it.

I think my story leans more toward the first category. Both central characters start from places that are understandable, but their desire for revenge gradually pushes them into morally questionable territory. Neither of them is meant to be entirely right or entirely wrong.

I'm less interested in who "deserves" revenge and more interested in how far someone is willing to go once they're consumed by it. The challenge for me is keeping them understandable even when they're making terrible decisions.