We've all seen the Osama Bin Laden targets. Most people chuckle about that.
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.