At its core this movie is not so much a thriller as an intense movie about...
Grief. How we deal with it and cope (or not). How personal and hard it is. Eden was taking it even harder than Will. She tried to slash her wrists the first time.
And so what, they decided that everyone would be just as willing to die along with them?.. A very strange brand of grief, I say, if they think they can make that choice for other people.