Trust me, I've seen worse. I've had people complain that I'm abrogating their 1st Amendment rights because I won't let them shoot pictures of current political figures. It doesn't matter if they're portrayed as zombies, clowns, or monkeys: it's in poor taste, and it gives us all a bad image.
The "zombie" euphenism does seem to be code-speak among some quarters, much as the term "goblin" was used a decade or so ago. Code-speak for whom? Take a guess.
I STILL hear talk of what would hapen if the "Goblins" or "Trolls" from Chicago or Milwaukee got out of hand at gun ranges and gun shows all the time. Though I have been slowing hearing the term "Zombie" slipped into conversation where you would not expect it.