If the governing ANC ignores the calls for Zuma's resignation,it may undermine South Africa's leadership on the continent. It creates the idea that he can undermine the constitution with impunity.
Lobbying political actors to achieve particular outcomes is an acceptable practice in a democracy. But state capture, as is allegedly happening in South Africa, denotes holding the state to ransom.
South Africa's governing ANC has to respond to public outcry about state capture or run the risk of electoral losses.