(breaking this up to make it easier to follow)
Marauders aren't "just another civ", at least they way they are represented in the lore, described in the Wiki, and implemented in the game.
Marauders are bitter and antagonistic toward "established" civilizations. They do not trust them because they betrayed and abandoned them in the past; who is to say they won't do it again? The Kami and Karavan both are also similarly distrusted, because they abandoned them as well. Remember, Marauders are the descendants of the people left behind in the Old Lands after the Great Swarming. They survived, despite the odds, despite being abandoned by everyone they knew at the time.
Marauders aren't "just another civ", at least they way they are represented in the lore, described in the Wiki, and implemented in the game.
Marauders are bitter and antagonistic toward "established" civilizations. They do not trust them because they betrayed and abandoned them in the past; who is to say they won't do it again? The Kami and Karavan both are also similarly distrusted, because they abandoned them as well. Remember, Marauders are the descendants of the people left behind in the Old Lands after the Great Swarming. They survived, despite the odds, despite being abandoned by everyone they knew at the time.