What are a few themes of the short story "The Destroyers" by Randall Garrett?

One theme of The Destroyers is that a persons way of life is just as
important as his life.  Another is that you should not assume you know what is best for others.
 Finally, sometimes the simple life is the happy one.

Any war is made up of a horde of personal tragedies--but
the greater picture is theof the death of a way of life.

The story opens with these ominous lines.  We know that the theme
of the story will be related to the death of a way of...