Billionaire businessman Rob Hersov and ANC activist Carl Niehaus have found something they agree on — that President Cyril Ramaphosa needs to resign. But that is about all they agree on.

In an online video that has emerged this week, Hersov described Ramaphosa as a “useless, spineless failure” who should resign. He apologised for his family funding “such a disgrace to become the president of our country”...