They call them wall builders, ultranationalists and downright demagogues. They are on the rise across the world and their brand of politics poses more danger to the world we know today. South Africa is facing its own true test as it prepares to elect new leaders at local government.With anger and disillusionment running across the nation, we have a duty to protect the inclusive vision forged by our past leaders.It remains true today what Nelson Mandela stated when he called for a united nation that will work for a common goal.But today we are faced with shallow leadership across the world.From Europe to the US, Africa and Asia, we are confronted by the rise of nationalists.The rise of Donald Trump in the US, the British exit from the EU and African leaders' blame game arerecipes for disaster for this world.It is important that we raise our voices when a politician campaigns on a ticket of fear and exclusion.It is more crucial that we crush the walls of separation being built across the world and join forces with those forces that believe in a united world.It helps no one to build walls to keep out those who don't look like us. It helps no one for President Jacob Zuma to demonise diversity.It is even more dangerous when a head of state preaches politics of fear and exclusion.We should remind Zuma of the hardship this nation went through when race determined one's station in life.We should remind him the ANC of Mandela welcomed former National Party leaders to its fold.We cannot afford to be driven to a world of unreason.A free world stands to benefit more when it builds bridges and seeks ways to better the lives of the downtrodden.The elections on Wednesday should strengthen our resolve to seek better ways to advance this nation...