Do Not Resist Mercy (Matthew 5:38-42)

Christ tells us that we are to turn the other cheek if someone slaps us. If someone takes us to court we give them more than they are asking in the settlement. If someone wants us to go one mile then we go with them two miles. If we take these words at face value they can become rather burdensome to the abused and the afflicted. We know that God defends the widow and the orphan so how can we care about injustice while hearing an exhortation to tolerate injustice?