One also has to think about how long it would take for the masses to learn what it takes to actually kill them, without media being available. I mean, they're brain-dead, why would it occur to someone (unless they saw it in a zombie movie) that the way to kill them is to blow out their brains? And of, course, a real zombie invasion, wouldn't neccessarily follow the rules of commonly known zombie movie rules.
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?