Lateralus
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You're not looking at all of the data. There was an uptick in violence starting in the 60s, through the early 90s, but I'll get that in a bit. The likelihood that someone will be murdered (murder includes war for the purposes of this post) in their lifetime is less than 10 in 100,000. That varies from country to country. It's obviously a lot higher in places like Iraq, but in Sweden, the number is about 1 in 100,000. In the US, it's something like 4 in 100,000. This murder rate has been steadily falling for the last 5,000-10,000 years. The murder rate in prehistoric societies (hunter-gatherer types) is estimated to be around 500 in 100,000 based upon based upon skeletal remains from that time period. Medieval societies had a murder rate of around 50 to 100 per 100,000. If you look at the general trend of violence throughout history, there is a clear decline. It hasn't always declined. Just like there are "warm years" in the temperature record, there are periods where violence did increase, but those were temporary. If you're interested in some explanations for why this is happening, I recommend Steven Pinker's book: The Better Angels of Our Nature: Why Violence Has Declined. It's not a perfect book, but it puts forth some pretty good ideas as to why violence is declining.here is a link with info on violent crime statistics in the US since 1960. a bunch of charts for individual crimes too. while it's great things have gotten better since the peak in the 90s if we go back a few decades we can see crime has increased quite a lot overall.
As for the uptick in violence in the mid-late 20th century, leaded gasoline is the culprit. The evidence for this is overwhelming. I won't go into the details in this post because there are a couple articles on the subject that explain it better than I ever could.
How Lead Caused America's Violent Crime Epidemic - Forbes
America's Real Criminal Element: Lead | Mother Jones