It's about socialism. Didn't know that either. Compare the actions of Raskolnikov with those of the communist revolutionaries (Lenin, et al). A system of government that uses violence as a legitimator, with the good intention of spreading wealth, can succumb to happenstance (shit can happen) and the whole thing can go wrong. Those in any way involved in the violence and killing inherit some heavy karma.
Excellent psychologial novel. The question in this murder mystery is not "who" but "why".