http://en.wikipedia.org/wiki/Crime_in_the_United_States
The USA murder rate was 5 per 1,000 in 1960 - peaked around 8/9/10 per 1,000 from 1973 to 1993 - then took a free fall back to the present 5
What happened from 1973 to 1993? - after Vietnam War - before the Gulf War - maybe it was crack time? - maybe the most violent people were on
the streets of the USA instead of being at a war somewhere?