One of the things that's always bugged me about the Walking Dead-verse - and I realize this is when people angrily remind me THAT ISN'T THE POINT OF THE SERIES - is how much the total collapse of civilization doesn't make any sense at all. There's apparently a two month, at most, gap between rick entering a coma and the whole world going to shit, and never even so much as a throwaway line explaining just how everything went completely collapsey so quickly.
I mention this because it connects in my mind to the utter lack of humanity exhibited by literally everyone the survivors come in contact with. Much like how we're just supposed to accept that the United States, which has weathered some pretty major disastrous turns of events in more than 200 years, would completely fall apart, we're also just supposed to agree that literally everyone would become a pedo/cannibal within a year.
I mean, get that tough times can bring out people's inner monsters. But I also know that history is replete with examples of people in situations as bad as this one (minus living corpses of course) who didn't turn into rape gang cannibal fascists. I think we have to just chalk it up to Kirkman's rather dour view of people, and his discomforting political bent. His series, so I'll let him have that. But man it gets... old.
All of that said, once you've established the rules of a universe, having characters consistently fail to grasp those rules while somehow surviving is infuriating.