I see what you mean, but this is not what the Walking Dead is about, and it never was, nor I think it will be, it deals with people's feelings and minds, when world suddenly falls to shit around them, so they will focus on humans more than on the walkers, because walkers are just simple and plain, and easy to outsmart, I actually can quote Molly here "It doesn't take much to outsmart the dead, bunch of shitheads..." and that is the point, if it wasn't for the living, both Lee and Rick's groups would have the whole thing sorted out by where they are right now in their stories, I'll focus on Lee here, since this discussion is about the game.
If it wasn't for the cannibalism thing and the bandits, if the St.Johns would've been decent people, Lee's group would have been save there for a looong time, they would send two guys out to siphon for gas each day, the St.Johns would keep growing food, the fences would keep the walkers out, and 1 guy would watch the perimeter, incase one of the dead gets over the fence somehow, and they'd live in peace for a long time. But it didn't work out that way, since the living always screw things up - but they also make things interesting, if it wasn't for the bandits, the St.Johns, the stranger, Crawford et cetera, this game would not have been as interesting and exciting as it is.
Focusing on the dead only, or mostly would make things too much of a routine and simply too... easy and well... simple, killing dead, scavenging, killing dead, scavenging, that would turn out to be boring as hell.
The cure is a lie!
Oh what I wouldn't do to protect Clementine.
"Got bit, fever hit, world's gone to shit, might as well quit."
"We were STARVING, and it was COLD!" - "so MY
FAMILY STARVED IN THE COLD!"
"Thou shall not fear the terror by night, nor the arrow that flies by day, nor the pestillence, that walketh darkness, nor the destruction, that wastes noon day." - Hershel Greene