As for the original comment, the movie focused WAY more on the bug war than the book did. But admittedly, focusing 3/4 of the movie about classes and talking probably wouldn't make a good movie.
In regards to yours, the movie actually parodies the political views in the book from what I recall.
As for the political views of Heinlein, his view is largely what brought Nazis to power in Germany - the belief that communism or fascism is inevitable, and fascism is preferred to communism. Jack London feared socialism or a plutocracy was inevitable for America in the early 1900s, and I think Heinlein's view is an evolution of that based on the rise of Communism (plutocracy is almost oligarchy, and oligarchy not far from fascism).
I've recently thought about what exactly was the "breaking point" of this and other movies I hated that other people love. Many of these movies I enjoyed until that point, but that point onward the movie was completely ruined for me. Some of these are pretty trivial, too. With Starship Troopers, it was bugs shooting ships in space out of their asses. With the Matrix, it was using people for electricity. With Independence Day, it was the completely unrealistic physics (I had the same problem with V, btw - those ships would literally crush the cities if they entered the atmosphere), With the Hobbit it was that ridiculously long and improbable mine car ride and the cartoonish goblins. With Avatar it was Unobtainium (floating rocks I'm fine with - it's an alien world, so magic is fine - that word is a total groaner).