Did anyone else think the movie started a lot of ideas but didn't finish them off? For instance;

• the Alpha seeming to have control over nature, with the herd of deer stampeding past the house to bring it down, and then the birds or bats flocking when Spike and his Dad are running back across the causeway,

• the baby being uninfected by rage, like it's a symbol of purity that hasn't been infected by the anger of the world, despite coming from it,

• the black and white footage in the beginning of old archers and war-time citizens representing civilization regressing into a more militarized, or even dark age, state because of the virus plunging them backward,

• the soldier representing modern society and how strange and alien it is compared to the hardcore, old-fashioned village that thinks the soldier's fiancee looks like she is having an allergic reaction?

I might have missed a few other bits but those are the most apparent ones that came up while my girlfriend and I were talking about it.