Originally Posted by hall
Kirkman has stated many, many times that he's not going there. As he said on Startalk, "it's here, deal with it".
He doesn't want to get into the science or medical aspect of it because people will endlessly look for or find flaws in it.
That sounds lazy to me.
He doesn't think people will like the answer? Then come up with a better answer.
The problem is, he hasn't remained consistent with his own universe, so he can't. For example, at the CDC, it was specifically shown that, as a zombie, only the brains stem was keeping the body upright and mobile. The rest of the brain was inactive. Yet, we see that any sort of head trauma "kills" the zombie, not just destroying the brain stem.
Further, there still has been no explanation for the mysterious traffic jam on the highway where people obviously have died suddenly for some reason, not related to being zombies. How did those people die?
Look, plenty of zombie plots have involved anything from a viral outbreak to the original cause from "Night of the Living Dead", which appeared to be some sort of meteor strike of mysterious origins. We accept the cause because it's the cause they come up with and remains consistent throughout the movie or TV show.
Kirkman can't come up with a scientific reason because he failed to plan for one from the very beginning.