The only conflicts that the main characters really ever encounter, are the unintended side effects of their mad drive for change.
Btw, if you're seriously arguing that the majority of character's in G-L aren't shallow, simply because of they are "based over ver broad yet substantial ideas," you clearly have no idea what good characterization is, do you? Good characterization is when a character possesses a uniquely complex world view, which manifests itself through the actions and dialogue of said character. The characters in G-L, are too one-dimensional, in that ALL we can see in them is determination to do what is "good" in their POV, whether that manifests itself though a mad desire for change, or through population control or whatever. They really have no other depth to them other than a determination to do "good."