The Sky Marshal stepping down would be more like Hitler himself stepping down from power after operation Barbarossa goes south. Its just not really analogous, The Federation more closely resembles the Roman Republic than any sort of fascist state.
But when the first Sky Marshals plan ends in a disaster he just accepts his fuck up and steps down. That is like the exact opposite of a fascist state.
The biggest flaw of your argument is that they bugs in the movies do actually inhabit a fairly large section of space. That means they clearly do have a form of space travel and colonization.
I mean that isn't what is depicted in the movies but that is clearly what we are discussing so fuck the bugs they are disgusting bugs and need to be sprayed with a giant can of raid
They were literally launching meteors at earth and other planets its made clear in the first movie that they do that. FTL is never actually clarified for either side so we have no choice but to assume both sides are capable of it.
What exactly is the goal for this argument anyways? At worse the bugs are just a highly dangerous invasive species that needs to be eliminated by your own arguments. So I am not sure where you are going with this.
They actually do have that ability and its described as to how they do it and its part of their colonization process. At best they are animalistic and a highly lethal invasive species but as the later movies show they intentionally do this.