These beliefs, to all accounts, appeared quite suddenly in recent history. Perhaps they could disappear just as suddenly. What we need to find is what it takes to make them disappear, and perhaps it could help to find what caused them to appear in the first place.
The DRC, like other African countries, has long had many people who believe that misfortunes are caused by witchcraft and sorcery. What appears to be new is the belief that these witches are young children, and that it is occurring on such a scale. Perhaps it is the very fractured nature of the society that is causing these beliefs to spread and be deeply held.
Hat-tip to What is witchcraft.