Well they also need things like engineering know-how at a bare minimum. And ok, sure there are libraries all over the place but really, it takes time to become skilled, that's part of why Henry was sent off to Hilltop. So many people have died, there are many people with no relevant skills, they are just doing the best they can. So far as we know, The Kingdom was falling into disrepair before the ZA happened so really, Ezekial and his people were lucky to have made it as long as they did there. Also, fire is a very serious threat for all these people. At best, each settlement MIGHT have some sort of fire brigade but more likely people havent even thought that far ahead. That would explain why 1/4 or more of The Kingdom looked burned t the point of unsuitability.
Thing is though, if the show is willing to make the effort to show this decay, how do TPTB expect us to accept the whisperers? I mean we saw last night Elpha getting whipped hard enough to draw blood. Whisperers are not clean, in fact they are the opposite of clean. Having open wounds in that environment will absolutely lead to infections, like sepsis. Without prompt medical treatment, sepsis kills. So do gastroenteritis, hepatitis B and C, HIV, enteric intestinal pathogens, tuberculosis, cholera and others diseases can all be caught by messing with cadavers like that (wikipedia).
ALSO, seems to me if the whisperers are willing and able to head to damn Florida for the winter, why the hell wouldnt they just STAY THERE? Elpha's a mean lazy fuck, I think she would stay down there.