Well, Zimbabwe isn't a threat for weapons proliferation. They certainly can be a destabilising force regionally, which means that the World community (ie US, England, EU, UN, in that order) should support South Africa as the regional power/influence in a manner to mediate/fix the situation. This dovetails with South Africa's view that they are the influential nation in the region, and other bodies shouldn't be interposing themselves. However, if South Africa continues to refrain from wielding influence to alter the horrid situation, the World Community should probably get more involved, in stages (sanctions, opposition support, perhaps even peacekeepers/military action). We are a LONG way from any intrusive measures, though.