The question this week for South Africa’s president Cyril Ramaphosa was not how he has survived a scandal involving a Sudanese businessman with a penchant for buffalo, half a million dollars in cash, and a sofa on his private game farm. It was why, halfway through the mother of all repair jobs to an embattled young democracy, and five years into a presidency he waited decades for, his immediate inclination was to resign over the whole outlandish affair.