A lot of the time they crap in chamberpots, the streets or in the fields. Not much running water for flushing toilets or effective sewage treatment, and power is pretty much none existent. Privys exist, but they are not always convenient when the urge strikes.
It gets to be a vicious cycle. You get the cramps and need to go right now - the commonest symptom of cholera - and the flies get at it then land on peoples faces, eyes and food. The infected person's hands don't help - assuming they are scrupulous and wash their hands afterwards, they won't have soap with them and they are usually washing in water someone is going to use for drinking.
Then there is the fatalism aspect. Mentioned that before. What is, is. Makes it hard to bang into heads that a bit of basic hygiene prevents what is from being is.
You could give every town and village in South Sudan a clean, deep shared well (far below the infection levels) and enough privys and lime to sweeten them for under a million dollars in materials. No one wants to do that.