((OOC: Message is IC, in case it's not obvious from the content. It's a culmination of what I've been able to piece together about this game and some of the original story goals that may have existed in the minds of the original concept artists. Perhaps. These are the thoughts and conclusions I've been led to believe, and it's easier to present them from an IC point of view. Replies need not be IC))
Concerning the Kami and the Karavan, we have little objective material to use to form opinions. Obviously you can't trust a word of what they say about themselves or about each other.
The kind of opinions we can form can really only be based on how they appear to us today, and what the histories have said -- assuming the history hasn't been modified. Even their promises are suspect until proven true. And, as you may have guessed, I have my own opinions, which I'm going to freely share
Jena may or may not be some super-powerful being. However, the technology the Karavan wield is strange, foreign, and awe-inspiring. But in their mannerisms actions, behaviours, and apparent way of life, they want no part of this place. Their curioity about the Goo seems limited to the fact that it's something new they don't understand. Once they do understand it, I feel little doubt that they would use it against whomever they wish, even to the point of destroying a planet they care nothing about and want no part of.
The machinery of the Karavan simply does not belong on Atys. It stands out as an eyesore, interrupting the flow of the landscape. And the eminations from that machinery wreaks havoc with the wildlife. It is not alive. It does not grow. Sap does not flow through it. It must be constantly maintained to avoid deterioration.
Ma-Duk is said to be basically a being a sort of energy, not necessarily a corporeal form. He supposedly created the Kami to serve him and protect the planet. I know that's information deviating a little from the "here and now + history only" aspect, but it's useful information to use to make my point, and I don't recall it ever being in dispute by either side, either.
I believe that Ma-Duk is the manifestation of the spirit of the planet itself. Remember, everything on this planet is alive -- there is no inorganic material apart from what the Karavan bring. The Kami and their mission of protecting Atys first and Homins second seerves only to reinforce this fact. They are, perhaps, not something to be worshiped as such, but more like something we should endeavor to cooperate with and respect.
With the Goo, the Kami are deathly afraid of it because it literally is infecting and killing the planet. They don't need to study it to know it is dangerous and must be eradicated, they can feel its effects in the very core of their existence. The fact that they want homins to help them eradicate it hints at an extra-terrestrial origin for homins, though Goo is no less dangerous to us either.
When we fight the Karavan (and I don't mean the homins who support them), we are fighting foreign entities to this planet. True, homins are said to have originated somewhere else, but they have integrated themselves into the planet and the way it works much like a herd of bodocs. In the wild, there is always someone who can eat you, no matter how big you are. Homins have relatively few predators other than each other, so the Kami need to keep an eye on them to make sure they don't ruin the planet.
When we fight the Kami (again, not the homins), we are fighting the planet itself. If we "win", we will destroy the planet that sustains us. Remember, the sap of Atys flows through our veins and is where we get our ability to manipulate the magicks. It is undetermined whether or not homin life as we know it can exist some place other than on Atys.
((OOC: I could never choose Karavan, since they do not fit into the theme of the planet. I only chose Kami because a friend joined a friendly guild that happened to be Kami, and I joined with him. I don't know that I could choose Kami either, though supporting them is better IC if you are concerned about the welfare of the planet))