Why do we glorify horrible people from the distant past?
Julius Ceasar, Alexander the Great, Genghis Khan and many more...
These people had beliefs and worldviews that were so horribly, by today's standards, that calling them fascist would be huge understatement. And they followed through by committing a lot of evil.
Aren't we basically glorifying the Hitlers of centuries past?
I know, historians always say that one should not judge historical figures by contemporary moral standards. But there's a difference between objectively studying history and actually glorifying these figures.
I think it's a publication bias thing. Because so much was written about these people in their day, they become mascots for the time period. And what they did, while objectionable, is impressive. They had a massive influence on recorded history.
My own theory is that there is so much written in these times because of the massive inequality then. Books, statues, etc are expensive. In times of ecomonic equality, especially before the press, people would be less likely to waste time and resources on such things. Thats money better spent on improving their and their communities lives. But when you have massive inequality and a narcisist in charge, you get books, statues, and massive projects dedicated to the men who can afford them.
And we like winning more than we like being moral.
I wonder why when it comes to "humanity is awesome" variations of sci-fi, we always have to lean so hard on creating a fictional alien race that is somehow worse than humans to prove how "awesome" we are.
Maybe, just maybe, we're kind of fucking assholes.
Those aliens also display a core experience that we have anxiety about: being colonized. Interestingly, Stargate, a franchise partially created by the US Air Force very accidentally portrays what interacting with alien species who didn't establish a system of colonization might look like. There are multiple cultures humanity encounters in that franchise who don't have weapons but have farming implements we can't even imagine. That franchise shows a universe where Humanity leaves earth and discovers we're a bunch of violent weirdos who don't fit in with the rest of the universe. There's some other colonial powers we encounter, of course, when Earth needs to be the good guys. But like... Think about that. We might be so steeped in a system that's been inflicted on us that our first contact with a non-earthbound culture might see that culture being like "so the workers produce all the value, and you beat them up? Why? This doesn't make any sense. Shouldn't they be rewarded for the value they provide?"
I think part of it also stems from our "colonization" of other species on Earth.
We exploit the living shit out of every other living thing while telling ourselves those living things are somehow different from us, don't experience the same fears, the same pains, and so on. Those of us with an inkling of self-reflection can see how they are like us just by looking at how they react to similar stimulus. We aren't different but we've spent a millennia telling ourselves that we are simply because we have language and can create tools. Both things other animals clearly have and do, but since we don't understand those animals, instead we treat them as inferior.
I think part of the panic of colonization of other species comes from the deeply rooted realization that we have been brutal, violent executioners of millions of species who may have had similar reasoning capabilities as we do but simply don't have thumbs so they can do things like write down their language or codify it in any way. Like how humans lived for millions of years without written language...
Anyway, yeah, visceral guilt for being real fucking bastards and killing off so many species that we literally kicked off a mass fucking extinction.
I feel like the show does a good example of being entertaining while also showing those stark contrasts between the civilizations like you've commented. Even more so in the later part of "Stargate Atlantis" where it's more "cowboys and indians" style. They're trying to "save" all the planets in the Pegasus galaxy but tend to shoot anything they don't understand and constantly undermine themselves by making poor decisions when it comes to relations and dealing with people. The inhabitants of the galaxy have continued being successful at trade and socializing (except for a few outliers who can still be known to show honor) even while being under constant threat for their entire recorded history.