Vigilantes and Self-Defense

Pizza Man Shoots Robbery Suspect

The title of the written piece is much less inflammatory than the associated video clip, where the defending pizza man is said to have 'murdered' the customer who tried to rob him.

A Vigilante is someone who doesn't allow the legal system to operate, takes matters into his/her own hands, and avenges a wrong. Does the media even know the meaning of the words they are using? Is english their second language?