To deny people their human right is to challenge their very humanity... Nelson Mandela is a symbol of human struggle for justice and equality . he stood up for what he believed no matter what consequences will he have to face in the future. 
he fought against South Africa's apartheid and ended up imprisoned. 
after his release he immediately plunged himself wholeheartedly into improving lives of others.
He believed that people should not be denied their rights ...A person is forced to fight for his rights when they are being violated by others...