I don't agree that laws should be used to define morality. I'm making this argument based on the set of laws we have already instituted in our society (since those are all we have to base our theories off of). Therefore, based on the laws we have created (whether they can be weighed morally or not), I think it's unfair to judge involuntary manslaughter differently from intentional murder. Whether it's a thief whose gun accidentally goes off and kills one of the robbery victims, or a man who premeditates killing his wife, the disregard for human life remains. I don't think it's fair to discriminate among these crimes when both of the members convicted engaged in risky behavior that puts another human being's life in danger.