Have we learned nothing from watching zombie movies? It's not the zombies you need to watch out for, they are slow shambling wrecks. It's the other human beings' reactions as society crumbles that'll really scare you.
Very true, people's emotions tend to take over any rational thinking, and the results are pretty scary.
That said, your comment reminds me of a particular part in the game Left 4 Dead(a zombie FPS) where you see graffiti scrawled along the walls on one particular safehouse that reads, "MAYBE WE ARE THE MONSTERS, NOT THEM!" with an arrow pointing to another bit that reads "Hey asshole, have you looked outside?!" :)
Speaking of which, I highly recommend World War Z by Max Brooks. It is a brilliant book and provides an amazing insight into human and society behaviour in time of crisis.
