Always fascinates me to see journalists that do absolutely no homework on what they’re writing about. The book is a 3 hr read max; at least read the book an do some bio reading about Heinlein, idiot.
The movie was a satire of the book. The director did not like Heinlein’s book so he satirized it.
First and foremost is context and the book was written in i believe 1959. And yes the book is far better than the movie but in this day and age movies are largely not made to espouse politics but to put seats in chairs. If someone wanted to make a movie making a political point i could probably go through my sci fi library and find an easy dozen, Kim Stanley Robinson’s Mars trilogy for instance.
Secondly it’s been some time since i read the book but i don’t remember anything about Heinlein assigning blame to one side or another as to who started the war although that point is rather central in the article and i really don’t believe the point is discussed in the movie at all. Since it’s the movie being critiqued i’m not sure why the writer even went there.