How could the Clintons pretend to be friends with the Kennedy family for so long only to betray them in the worst ways imaginable?

The Clintons were guests in John Jr.'s home and he was a guest in theirs. It's hard to believe that this family can make so many put their faith and trust into them. How can they sleep at night with all of the blood on their hands. They have to face justice for all of the pain they have caused!