Earlier quoted context omitted.
Starship Troopers (the movie) is a terrible example of satire because it fails to show anything substantially bad. When you present a society that's more ethical than real life, nobody's going to care if some people wear uniforms that look a bit like Nazi uniforms. There is a genuine existential risk, and it's addressed in the best way possible. Military slavery ("conscription") is more evil than disenfranchisement,…
This is all intentional. The film is emulating the type of film that would be produced by this fascist regime, of course it isn't going to include proof of the fascists being wrong. But we also don't see any evidence in support of their claims of an "existential threat" beyond the fascists claiming there is one. And since it's from the fascist perspective, the lack of evidence justifying their actions ends up support…
There's no frame story to support this. Going by the available evidence in the movie itself, it's a conventional action movie.