Yah Joseph, and brevity goes out of the window when the matter is a really complex one. If you don't want to read my post, of course you are free to do so, but you don't have to inform everyone about it. It's rather self-defeating.
Gilgon: There are many "greater goods". Those are subjective. I use the term "Good" to refer to the Ultimate Codex of Lightie Behavior. So yes, Jack follows what he believes to be the greater good. The safety of his beloved nation and those within in (and if he must sacrifice one of his own, no biggie).
"Saying that he is devoted to his country and 'not to human life' is a joke. Of course, a man is more devoted to saving the life of his family member, for example, than for the rest of men. That doesn't mean that he is not devoted to human life. "
-American- life. Life of USA citizens. And EVEN within this, he kills a witness. It means he's not devoted to human life itself, but particular lives. He's picky. He's a hero, yes, but who said grey auras can't be heroes for SOME people?
Tat, ruthlessness might be an element in Lighties, but not "sometimes" or "often" or "all the time". Rarely, if ever and not to the point where it should be called that. Stern, harsh, devoted, unyielding, so many other beautiful terms that describe exactly this strength of character, will and devotion without implying one's ready to harm others for it.
Ruthlessness can also mean cruelty. It is a negative concept no matter which usage we examine and, as such, directly opposed to the concepts of Positive/Good. So is murder. Yet Lighties kill, sometimes. They are forced to do so. Do they kill lighties? No, never. They'd better find SOME way to NOT have to kill lighties, if they want to not be hypocritic bastards, and ultimately, Grey. Do they kill others, generally? Yes, if they must. They -try- to do it rarely, because it -is- innately a "Bad" thing to take away life.
Causing harm, and especially taking away life causes what scientists call "psychological trauma" on every man, and you can also look that up. In the medieval fantasy setting of SKs, the trauma would be severely lessened under particular circumstances (such as a Lightie defending Lighties against Darkies or doing it for the sake of his 'good' God). It is also lessened because death is not permanent in SKs.
Thus the respect for life part. You respect life, but sometimes have to take it. Make sure you limit this "sometime" to as little as possible if you want to still have a heart after half a lifetime. The less harm one causes, the less guilt he has to justify to his conscience and the world.