Dashiell Hammett once wrote that liars were more easily fooled by lies than honest people. (He was a detective. He had some experience in this.) I also heard that people with a slight tendency to dishonesty make better marks for a con artist than rigorously honest people: that any tendency to cut corners makes a person easier to hook with a get-rich-quick scheme. Hmmm.
As usual, the Bible knew it first.