In many Mexican cities, water is treated as a political bargaining chip – a favor that public officials can trade for votes, bribes or power.
The Rwandan model can't be replicated easily given that it depends heavily on political dominance and tight, centralised control of patronage networks.
Democracy resulted in a sea change in the governing ANC. In the past, only highly committed idealists joined the party. Today's splits and factions are about patronage and clientelism.