Heh... ^^; why isn't anyone else joinig the discussion? :? Oh well... 
I guess, no one else really cares about the series to this degree.
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I said "killing people for a living"! There are many reasons that would lead a person to kill another. Some might even be justified! But when you do it for the money I consider that a bad thing...
Ah yes, this is the topic of moral and ethics.
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The usual counter-argument here is that life is only sustained by killing, which means that to live you need to kill. Whether you need to kill particularily fellow humans in order to survive depends on the situation.
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And that's precisely the reason why I dislike the idea of a soldier's philosophy. I praise individuality. The freedom to think for yourself and take important decisions for yourself, and most importantly, to take responsability for your acts.
Yet, human society is not just a bunch of individuals who only live for themselves, is it? Individuality alone cannot guarantee you a (happy) life. Unless you have something to hold onto you soon become confused, lose your way and die in misery. On the other hand, however, being a part of a whole your entire life may prove fatal when you are suddenly left alone. That was made pretty clear in Limelda's story.
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You said yourself, you disliked her decision to kill Madlax, which in turn made her kill Vanessa instead. Yet it was her own, free-willed decision and she accepted the responsibility for it, by offering Madlax her life as a retribution. And still you don't like her. Isn't that just because it's generally not a good idea to make decisions without consulting others?
As logical as it might sound, it's still a pretty cold and uncomprehensable position to take. I can't quite believe Madlax would rationalize in such a cold logic after the loss of someone important to her. Her only friend as she said herself. Even if Limelda's act was self-defense, even if Vanessa was foolish, why should Madlax take Limelda's side? Why should Madlax ever take the side of her only friend's murderer? :? (you see now why Limelda is a bad influence to Madlax? It's like her insanity is contageous! ^^; )
Ok, if you don't like my cold-hearted arguments, I can try the emotional approach: is Madlax a likely person to carry out personal revenge? You ask, why Madlax sided with Limelda after what she's done to her. Well, who else did she have? Approximately at this time, she became slowly aware of her true nature (as seen in her responses about herself) and therefore she desperately needed some proof that she existed at all. Limelda's "dark" and "insane" obsession with her was just what Madlax needed. Like hell was she gonna kill someone who was so sure that a person named Madlax was really there for some time!
If you recall, the idea of losing oneself played a great role in another episode of the series, the one about the detective who tried to find out about Enfant. Mr. Monday and his accomplices made every last trace of his existence disappear and, surprisingly enough, he's gone crazy. I think something something like that was what Madlax has feared. You see, she didn't hate Limelda from the beginning. For some time, she was afraid of her, that's true, just as she was a bit wary of Vanessa at the start. But she didn't hate her. I doubt she was even capable of hating anyone! And now you say that she shoudl've killed Limelda in order to avenge Vanessa, which, you admit, wasn't entirely her fault.
Your concept of God is that of a mere watcher who doesn't interfere right?. So why should people follow someone who's not doing anything to make things better? Why should people worship said God figure? You think they own It anything? You think people can really relly on such a God? I think people should only follow, care, help and relly on other people. Cuz people are the only ones who are able to do anything, no matter how small it might be. This isn't a "God hating" matter btw! I respect other people's beliefs and concepts. Just take it as a glorification of the human being! 
Ok, then let me ask you this: what has Christian God ever made for us, humans, except what's written in the Bible? Has Jesus Christ ever came down to Earth to help the poor, the hungry and the hopeless since that glorious morning 1974 years ago? Yet millions of Christians worldwide believe in his ideals and try to shape the reality according to them. And the world really changes because of this.
A true God never interferes but his image moves people. Throughout the history, there were countless incidents when people acted according to their beliefs even though these were never really confirmed. Now that I think of it, I come to the conclusion that there is no entity that can be called "God". God is an ideal that resides in the heart of every human. Yet there are some people who are more willing to live up to that ideal than others. Such people are what I call "Heroes".
Therefore, it is pointless to argue whether it is God that people follow or fellow humans, whose souls are for some reasons closer to the ideal. People follow those whose ideals, whose belief and devotion are stronger. Those who have nothing to say cannot lead others.
And not to go entirely off-topic... ^^; whatever it was that made me feel sympathetic towards Madlax's character weren't her "god-like" characteristics, but rather her kind and vulnerable human side! ^^
That's exactly why I put the third option into the poll - because of her character's complexity.
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