In Wilson's case, it's because he's a crime lord and Matthew's because he's a vigilante. Fisk takes great care to keep his nickname secret from his employers, employees, and rivals. A great example occurs when Murdock tracks down one of Fisk's assassins, who happens to be a current client of Nelson and Murdock. After Daredevil forces the assassin to reveal Kingpin's real name, the assassin nervously confides to Matt, sobbing, "I revealed his name. Don't do it, not to him. He'll find me... and make an example" (Rabbit in a snowstorm). Healy, believing himself to be a dead man, decides to hasten his death "in the worst possible way. By putting his head on a metal spike" (Kuchera and Polo). This act shakes Matthew to his core as he realizes the extent of the control Kingpin has over his subordinates. Even though Murdock never killed anyone because his name was known, he became chronic