Forgive me, but this is very naive.
Realistically, how long do you think it would take to make a significant difference in the living condifions of these people? A year? Ten years? One hundred years?
The fact is it is not going to happen in the lifetime of anybody reading these forums.
While I have no experience in South Africa, I live in a country where 70% of the people live in misery and destitution (by first world standards). Many go hungry, have little in the way of health care and live in houses that are frankly medieval.
For many, crime (robbery or drug dealing) is the only means they have of bringing some hope into their lives.
The current president of Brazil (Luís Inácio Lula da Silva) himself came from a poor background and has put a lot of effort into aleviating poverty here. In his five years in office, has he eliminiated it? No. Has he eliminated the crime that results from this poverty? No.
So, despite your good intentions, you're really going to have to wait an awful long time for this suggestion to turn into a solution.
So, what do you do about crime while you're waiting?