Be a strong activist, can we actually help other people in other countries?

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If you saw the movie, "The Machine gun preacher", it is about the life of Sam chider, who going through a drug junkie to be a preacher, and be an human rights activist in Sudan, Africa. He donate money and build school, orphanage for the local children. And until now, he still keep on fighting for those Sudanese children. The same for the recent story of George Clooney, who went to Sudan, and protest the inhuman condition in Washington Sudanese embassy. He was arrested. The question is, to be an activist for civil rights, how much can you help others, do you believe that you can change the condition of other people who still suffering in another country? I hope that with my little effort, we can do something, or even can change the world a better place to be. But it seems without a revolution, or war, it just won't happen easily. Would you agree?