Why are Perry and Dick depicted as evil in In Cold Blood?

larrygates

is of course a true story. Perry and Dick in the story formed the
design of robbing the Clutter family and further planned to leave no survivors. They spent some
time planning the crime, then drove several hundred miles to follow through. The multiple
murders they committed...

href="https://en.wikipedia.org/wiki/In_Cold_Blood">https://en.wikipedia.org/wiki/In_Cold_Blood]]>