I think we as a people find that in an arguement, it is more often easier to attck an object such as the person one is having the arguement with other than attacking the entity such as the topic or disscussion.
The perfect example is receiving bad news. The messanger also get's the first blame regardless. In situations like that, the defendent/ receiver of bad news, feels their position is compromised thus retaliating with an attack. Hence the killing of the messanger.
As much as I disagree with attacking the messanger, it's more like the nature of self preservation and self defence that causes these actions when ones position is compromised.
