By implying by omission that the killing was not mostly for personal gain, do you mean to suggest that it was for the public good, or to invoke a non-excluded middle?
I make no claim about the killing - that is at least arguable and inclusion would distract from the main point that the raping in the example given (historic war bands) was not.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.