"Shooting the messenger" is a metaphoric phrase used to describe the act of blaming the bearer of bad news, despite the bearer or messenger having no direct responsibility for the bad news or its consequences.
Until the advent of modern telecommunication, messages were usually delivered by human envoys. For example, in war, a messenger would be sent from one camp to another. If the message was unfitting, the receiver might blame the messenger for such bad news and take their anger out on them.
An analogy of the phrase can come from the breaching of an unwritten code of conduct in war, in which a commanding officer was expected to receive and send back emissaries or diplomatic envoys sent by the enemy unharmed. During the early Warring States period of China, the concept of chivalry and virtue prevented the executions of messengers sent by opposing sides.
A modern version of "shooting the messenger" can be perceived when someone blames the media for presenting bad news about a favored cause, person, organization, etc. "Shooting the messenger" may be a time-honored emotional response to unwanted news, but it is not a very effective method of remaining well-informed."
