Yes, and society generally doesn't find it acceptable to rape animals, either, which was my point. As a counterpoint, try to think of the most contrived example where rape can somehow be justified. My argument is it doesn't exist in western society, whereas this isn't the case for killing and stealing.
>>Nobody's thinking of self-defense when they say "we absolutely massacred them."
My point is that there are other cases where the of killing people is justifiable in some way. Self defense may not apply, but that phrase could be used when both parties are complicit in the killing. Generally, you'd use the above phrase in competitive events - that is, two parties fighting each other and one side winning in a landslide. Same difference in warfare - what separate it from murder is the complicity of both sides. Murder keeps getting thrown out there, but again, the analogies are more in line with general killing than murder.