Atheosis said:
While I agree with what you are saying, I would just like to point out that not every human has the same emotional reactions to any given thing. Space Marines are almost certainly aberrant in their psychology but that doesn't mean their psychology is fundamentally inhuman.
Not every person has the same reaction to warfare. Some actually enjoy it. Such individuals may ultimately join the special forces and make a career out of killing people. They're still human. Do you remember the huge firefight between a pair of criminals in body armor and the LA police back in the nineties? Those guys stood out in the open and actually seemed to be enjoying themselves. Such behavior is certainly aberrant, but it doesn't nullify that such individuals remain human and still have human emotions.
This is true. However, non-aberrant individuals could very well see such actions (those crazy guys in LA, Genocide death and **** squads in some of the ethnic cleansing conflicts various places around the globe, etc. etc.) as attrocity even though the actors, human, inhuman or otherwise see them as correct and righteous. Kind of the whole point.