Crime and Punishment

I think my question of what makes a good person is really relevant to Crime and Punishment. Raskolnikov is obviously not the typical "good" person. He did kill someone. But throughout the book he maintains that the murder was committed for the greater good, and if he truly believes that he was helping others, why should he not be considered a good person. Why should the opinion of other people make the final decision on an issue such as this? The characters in the story that can unanimously be called "good" are Sonya and Donia. The two women both truly put others before themselves and are even willing to sacrifice their way of life for the people that they love. In this book the qualifications for being a good person are self sacrifice and honesty, traits that both Sonya and Donia exhibit.