I honestly don't care why you unlawfully* killed someone. I don't care if you hated his skin color, his style of speech, his car, his attitude, his beliefs, or if you had no hate but he was just an impediment to your plans. "It's just business!"
What matters is your killed someone and barring one cited legitimate motivation, you ought to be punished accordingly.
Of course, part of the reason people start caring about WHY you killed someone is because we don't punish people who murder someone appropriately, so they want to make some murders worse than others.
*I have to stipulate that as ONE motive for killing someone makes it lawful: "I was in (legitimate) fear of my life and well being or the life and well-being of others".