Zombies are everywhere... a totally different threat from the ones we were afraid of in the 80s and 90s
Of course, Walking Dead is an awesome comic and tv show, but even the creators acknowledge there's a popular meme driving the public's interest in fighting off the unstoppable menace.
Zombies are the perfect embodiment of the troubles of our times... they come from nowhere, are relentless in their encroaching march, and eventually will overwhelm, no matter what we do.
But there is always hope, because humans in general, and western civilization in particular, are resilient. So don't fret over the current state of affairs, but remember, it pays to think ahead.