Why were the homicide rate in the late 60s/70s/80s/90s in America were so high compared to now?

Though the murder rate has spiked in the last 3 years. It is not as high as it were in the 1990s and before. In this decade so far, 2014 had the lowest homicides with over 14,100 killed. The highest of this decade was in 2016 with over 17,200. " (note) FBI hasn't released the statistics for 2017 yet"... show more Though the murder rate has spiked in the last 3 years. It is not as high as it were in the 1990s and before. In this decade so far, 2014 had the lowest homicides with over 14,100 killed. The highest of this decade was in 2016 with over 17,200. " (note) FBI hasn't released the statistics for 2017 yet"
In the 1990s, the population was lower but the murder rate was still higher than today! the lowest murder rate in the 90s was in 1999 with over 15,200 homicides. The highest of that decade was in 1991 with over 24,700 homicides.
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