One such ”conversation” is about time travel – a theme that lends itself to paradoxes, mind games and questions about free will versus predestination.
Full disclosure: I hate STARSHIP TROOPERS. I find it intellectually juvenile, dishonest, and wrote a damning review of it long ago. THE LIGHT BRIGADE seems partly to be a criticism of the political message and militarism of STARSHIP TROOPERS, which I don't mind one bit...
I've also read the novel THIS IS HOW YOU LOSE THE TIME WAR (2019) by Amal El-Mohtar and Max Gladstone, and I enjoyed it much more – interestingly, since its ”plot” also revolves around a war mixed with time travel.
I think it's because THIS IS HOW YOU LOSE THE TIME WAR deliberately focuses on the characters and the relationship between them, and makes a point that the ”time war” is too confusing to fully understand.
Read the book and make up your own mind.