One minor Land of the Dead hitch

[yendi]

One thing that bothers me about the setup of LotD, with the class-segregated city -- in Romero's world, everyone becomes a zombie when the die. That's part of why it spreads so quickly and is so hard to defend against.

So, in a city with major slums, lots of crime, guns, and drugs, why aren't there already some serious zombie attacks? It wouldn't be hard to imagine a bum overdosing, or a mugging victim dying along of a stab wound, then rising up and spreading the joy. Hell, even in Fiddler's Green, someone could have a heart attack and run amuck amongst the filthy rich.

Did I miss something here?