While I love this show for so many reasons I keep finding myself questioning the illogical thinking when it comes to survival and must remember this is really a soap opera that may not have any logic.
What I find odd that after all these years no one has thought of using a single boat or floating device or Island. Zombies can't swim guys so how about getting the hell out of Georgia and there are thousands of islands with year round growing conditions in S. FL and perhaps a million boats to choose from.
Staying in mostly land locked Georgia which can still have frigid winters makes no sense. The Zombies in FL are older, slower and weaker gums or maybe no teeth.
FL Coastline is littered with shoreline Hi Rises/Boats.
Find an Island, cleanse the Island of Walkers and the water freely prevents encroachments, many of the islands were used to grow fruits/vegetables long before they became Paradise for the wealthy. Sure beats trying to cleanse an urban metropolis where you may run out of bullets before you make a dent or become a banquet.
Problem is if they used logic the story of course may have a conclusion. Even Black Death in Europe came to an end in Europe as most all Viruses seem to. Perhaps the Logic comes to light whenever it has a final season. I understand the initial season they likely had a deal with Georgia Film Bd but come on the only place you can grow nearly all year is FL and Islands don't need walls built or maintained. So far, they are doing too much of the same thing and not learning from the past, that Solar warehouse was a perfect screw-up that should not happen 4 seasons later - that was a stuck on stupid event.
Shouldn't decayed flesh eventually be devoured by the insect population, that is the natural case for all creatures on the planet and it makes sense that insects would've consumed all walking dead other than newbies.
BTW - The moment with the Minister is a true Soap Opera moment which hearing - off with his head Marchione.