Let's accept that Robert Heinlein's politics were all over the place, starting left-leaning and getting more conservative over time. (The irony of the Libertarian who popularized TANSTAAFL having depended on his government pension has been noted by many people.)
Perhaps you will get to this in the upcoming episodes, but reading Starship Troopers without mentioning the Nazi concept of Lebensraum or Carl Schmitt's friend/enemy distinction seems like it's missing the point of why this book was considered so controversial. You did lightly touch on the point that Heinlein, like modern zombie movies, creates a kind of war without PTSD, because the enemy doesn't matter.
Traditionally, the officer/enlisted distinction was supposed to keep the officers from developing attachments to the soldiers, so that they would not hesitate to send the men into battle. Since Heinlein was making the point that the humans cared about their soldiers, I wonder if that's why he had the officers all being former enlisted personnel.
FWIW: I knew Orson Scott Card back in the 1980s, back before he decided that if you weren't Mormon you weren't human. Ender's Game was, in part, a commentary on the abuse of child soldiers. It just seemed worth mentioning in this context.