"a common criticism of Paul Verhoeven’s film Starship Troopers (1997) is that he imposed a layer of irony upon Heinlein’s straightforward story; but allow me to suggest that he was crudely bringing to the surface the irony that was already subtly present in the novel."
i've read a similar sentiment elsewhere & i still agree it's the only way you *could* make a movie out of that book: by making it jokey like a comic & letting the viewer think about how unrealistic/cruel it is
link: https://locusmag.com/2012/11/the-joke-is-on-us-the-two-careers-of-robert-a-heinlein/