Whats the title have to do with it?

The Criminals

             "In Cold Blood" to me was named so because of the upbringings and detached nature of Richard Eugene Hickock and Perry Edward Smith. The idea behind the title did change for me throughout the book because when I first started reading it I just thought it was named that because it was a good name for a murder book but as I read the book I realized that the title fits the characters so well.  The killings that they accomplished were just so detached and cold hearted and I believe that was a big factor for the title.