I think a lot of these ideas make sense. Another reason a lot of people enjoy horror and apocalyptic type flicks is because of the excitement that such a world provides. Often people find enjoyment in these types of movies because it provides an escape from their reality, which is often dull. I think many people can sympathize with zombies and their situation as well, and like to put themselves into these scenarios.
But I do think we are fascinated with zombies because we see more of us in them than we'd like to think.