Forgive me. You’re correct that the dead re-animating and coming to hunt the living is a completely unrealistic scenario (over at Cracked.com they give several very good reasons as to why it would be short-lived, even if it could happen), and that a rage-like virus is how it would/could occur. I was speaking merely within the mythos of the zombie genre, and that within that mythos, slow moving zombies could become an apocalyptic threat. But in Real Life, no, no such thing could happen.
Agree. For every shambling zombie that showed itself, you’d have a hundred people pulling guns on it and blowing it to smithereens. You might initially have chaos, but the phenomonon would quickly become more of a sport than a threat. [”Shaun of the Dead” makes this point too]