This thread is beginning to depress me. No one who kills, whether paragon police officers or psycho killers or gangsta drug lords or mid-eastern terrorists or US Navy SEALS, does so without tangling with the moral conflict between the necessity of taking a life and the gravity of killing. And where they stand can be radically different from how they are seen by their peers or the public. SEALS often have to retire because the guilt is insurmountable, while gangster cleaners and enforcers feel completely righteous in their position. Islamic terrorists are usually pretty solid sure that God is on their side (and no other religion can effectively contest that point).
During the cold war, the United States went to lengths to keep its nose relatively clean, at least in comparison to the Soviet Union. We could afford to be ideologically righteous. They were pragmatic in favor of the long game. (Today, both Russian fiction and games continue to have that air of necessity. I think it's cultural, influenced by Vodka-inducing winters.)
After eleven years of the war on terror, the United States tortures people, and uses robots to murder fifty civilians for every one high-value target. My country is the evil empire, and those terrorists who think they are rag-tag rebels fighting the good fight really are rag-tag rebels fighting a vastly overpowered enemy. And they certainly don't have to look far to see the atrocities of their enemies. (Granted, their regime will replace them with horrors of their own.)
So, yeah, the hero will always see the people he kills as the enemy. He will always see his murders as justified, his atrocities as necessary.
Go ahead and pretend he's the good guy, though. He does.[footnote]That would actually be a good twist for a game, where in at the end of the second act, the hero has a Falling Down revelation.[/footnote]
Incidentally, Vasili Blokhin [https://en.wikipedia.org/wiki/Vasili_Blokhin] murdered tens of thousands by his own hand in the service of his country as chief executioner of the Stalinist NKVD. And then there's Bombardier Thomas Ferebee of the Enola Gay.[footnote]I'll let you do your own research on that one.[/footnote]
238U