Americans always distrust and even resist people who are not of the same kind, so they will easily shoot at people who seem to have bad intentions. In fact, this (the reason for the high number of shootings) has nothing to do with the history of violence in the United States, the media, the innate criminal tendency of people of different races, etc.
In fact, the movie "Crash" discusses this phenomenon.
"Columbine School Shooting" is a typical example of that group of disadvantaged groups "accumulating grievances and revenge".
View more about Bowling for Columbine reviews
