Motivations show premeditation. And premeditation indicates that the perpetrator of a particular crime had time to think through the consequences of their actions. They had a chance to stop and think, yet chose to go ahead with their crimes anyway. There are numerous motivations in committing crime, some more morally reprehensible than others. A starving person motivated to steal food by the raging hunger in his belly is in a different moral category to a man who murders his wife to get his hands on the life insurance.
Hate and revenge are similar motivations for crime, and one would argue that neither can be justified in principle. However, hate on its own is arguably more serious as the object of such hate doesn't have to have done anything to hurt the perpetrator. The victim can be singled out, not for what they've done, as in the case of revenge, but simply because of what they are, because of their gender, race, or religion.