Having recently watched the film Eclipse in order to craft a drinking game based around it, I had the opportunity to notice something peculiar about the characters' arc over the course of the film. Namely, that the inaction of the Cullen family reveal them all to be fairly horrible people. Even for vampires.
Okay, I suppose that's a bit of an exaggeration - vampires are supposed to be horrible, and it's not like the Cullens are as bad as the throat-rippers from Near Dark. They're not a whole lot better, though, is the thing.
No, while we're told time and again that the Cullen clan is supposedly noble and pure and decent and everything you'd want from an adoptive family, their actions paint a completely different picture. While they appear pretty, polite, and positive, they demonstrate no characteristics that anyone could consider 'heroic' or even 'admirable', and through their self-centered inaction, they allow dozens of people to be murdered.
Let's examine it chronologically-