Who says it is okay? Certainly not me! Americans are the descendants of the Puritans. We were also influenced heavily during the Victorian Age (we still refer to "breast meat" as "white meat"!). Americans are repressed sexually. One of the outlets for that is violence. Violence has become our sex.
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Boxing,Hockey,Karate,Cartoons,The News,Movies(almost every movie made has violent scenes in them,even the G rated ones)... The proliferation of violence in our society is very widespread, in fact it would be harder to not find examples of violence.