Eating human meat would make humans live longer (in the same way as eating any other animal). It's still a crime, outside of dire survival situations. Why? Because unlike most animals, humans are highly intelligent. The same goes for any sentient, sapient, species (such as the Kelpiens). By the same logic, killing the rebels on that planet wasn't murder, because none of the victims were human. Do you see the issue here?
Was thinking of a situation of where eating aliens as a form of immortality rather than as simple survival. So if each alien increased someone's lifespan by 5 years, then eating 1000 aliens would increase their lifespan by 5000 years. Then there is the issue of Carnivores becoming a spacefaring species. It might be part of their culture to devour their enemies. Unless every alien race is just like us, then some alien races will have customs that we can't tolerate.
If it was a Terran Empire World full of Terrans that rebelled, then the Empress would destroy that world as well to set an example. It doesn't matter if they are Terrans or slaves. Loyalty = Survival while Rebellion = Death.
It may be acceptable in the context of the MU, but it isn't acceptable from the perspective of the viewer, which is the point
But is it acceptable to pose our human beliefs on an alien race? The only options are accept them, change them, ignore them, or eliminate them. Changing them might be the worst option since it could involve destroying who they were. After all, there is some fates worse than death as far as we are concerned like being turned into a Borg drone while the Borg Collective might believe they are doing something noble.
Still missing the point. It is proposed to make this individual the centre of a new series. There is no way, as portrayed thus far, Emp. Georgieu is going to be in anyway relatable to the audience, which is the first rule of good storytelling. This works in the context of her as an antagonist, because the Terran Empire is supposed
to seem heinous to us. The characters are supposed to be unrelatable because they're essentially morally depraved versions of their prime counterparts. What they are not supposed to be is the centre of our attention. We are typically given semi-good MU characters to relate to our main characters (the Prime characters), such as M. Spock, 'Smiley', etc. Without that kind of pivot? Georgieu is just an evil tyrant, and typically, Western audiences don't find tyrants entertaining. They find those tyrants getting killed entertaining.