I agree, and I am also of the camp of non-conventional notions about free will.<quoted text> unfortunately some animals kill for other reasons - as in males fighting for the honor of bestowing their dna on too many females. I do not think one can entirely whitewash the animal kingdom - but man is the worst of them. Since I do not believe in conventional notions of free will, I think there are plenty of causes of human misconduct (including murder), including of course the notions of several religious groups - now and in the past. But racism and nationalism and sexism and dismissal of the ill and old as useless, and other evil notions, including political, economic*, and philosophical ideologies, also lead to killings either deliberate or through heartless negligence*(*especially in the case of economic).
I think racism and the sort, are offshoots of our instinctive behavior pattern, keeping outsiders from our territory.
Race can distinguish groups, but it does not determine if the group is hostile or friendly.