Despite espousing the virtues of love and a "make love not war" kind of rhetoric the Nebula feel oppressive in nature.
They have hopes sure, but don't shy away from enforcing their will on another race (humanity), be it the moderate or the more extreme factions.
Perhaps we wouldn't have these conflicts if they informed humanity at large about what was going on. But because they have to be "observers" or whatever they probably feel that involving themselves in human affairs directly is bad or something. A line of thought that is patronising at best, and eerily familiar to colonialism of old.
It makes me root for the underdog even if I know I likely won't agree with their vision.