What are two major themes of the book In Cold Blood by Truman Capote?

It seems
to me that the two main themes of are the very old and traditional theme
of crime and punishment and the more modern theme that nobody is safe anymore in our modern
world. As far as the second theme is concerned, the Clutter family would have been safe in older
times because they lived in such a small and isolated community. But with automobiles and
superhighways we see a pair of desperados drive all the way across the state of Kansas to
intrude into the lives of innocent strangers and then all the way back. There is also the
incident in which the two murderers plan to hitchhike and murder the driver so that they can
steal his car. No one is safe anymore. We see virtually no hitchhikers anymore because everyone
is afraid to pick them up, and for good reason.