I first noticed the behavior in college. Coeds would partially block stairs at two levels to yell to each other while everybody else was trying to get to the next class.
Don't remember anybody pulling out a gun, knife, whacking, or even shoving the blockers out of the way.
Probably because subcultures vary in degrees to which sociopathy is tolerated.
There is a certain amount of narcissism involved in blocking a thoroughfare and ignoring everyone around you trying to get past. Woe to those narcissists who encounter the next level up in sociopathic behavior...