Yeah, we know, this theme isn't super subtle in the film. With all the references to a "Dark Lord" and his "Dark Mark" and army of "dark wizards," we are pretty clear on the fact that the Harry Potter movies/books are all about the battle between good and evil.
Voldemort and his ilk have no problem killing people to get what they want (which is basically tons of power and a more "pure" wizard community), and Harry is a total innocent who is kind to pretty much everyone and, well, keeps getting in Voldemort's way. The signs are clear: these two are headed for an epic throw down.
Questions about Good vs. Evil
- How has our view of Harry's innocence shifted over the course of his journey/in this film? Is he still the good boy we met in the first film?
- What about the fact that Voldemort now has Harry's blood in him, and Harry has his mark? Doesn't that muddy the whole good vs. evil thing?
- And then, what about the Death Eaters? What about Snape? Can they be "cured" of their past evil ways?
Chew on This
The film is very clear about good and evil: they're totally different things, and you have to choose whether to be on one side or the other.
There are people like Snape who seem to reform their evil ways, and Harry and Voldemort have kind of "tainted" each other—the film is setting us up to see things as more "gray" than "black and white."