In the book of Exodus we read about the life of Moses. He was troubled by the injustice in Egypt and how his own people were oppressed. At different times in his life, he took two very different approaches to confronting the evil.
In his earlier days, when he saw an Egyptian mistreating a Hebrew, he attacked and killed the Egyptian. No good came to his people, no good came to him, no good came to the name of God or the cause of righteousness. He fled Egypt as a refugee, a criminal and a wanted man. His violence had helped nothing. His fleeing had helped nothing.
He came back to Egypt when God sent him. Moses still cared that his people suffered; now he knew that God cared too. And nothing changed without the power of God. The Egyptians could not blame the Israelites for their calamities, because the calamities did not come from their hands. It took the power of God to free his people without the people resorting to bloodshed. God accomplished Israel's freedom through the power of the word, through signs and through wonders -- but not through Moses' attack.
There are different ways of resisting oppression. Evil must be resisted, but there are ways of resisting that only increase the evil. Without a devotion to what is right -- and with blood staining the hands of those who rise up -- the fall of one oppressor is followed by the rise of another. When a leader has seen God, and knows his unworthiness, and will lead to Sinai -- when the people will become a godly people -- then there is hope.