There was some discussion recently regarding the reasons that crime had been decreasing for roughly 25 years, the person doing the discussion implied it was only in Australia, but it was actually a trend across most of the developed world. The thing is we don't know for sure 100% why. But there's several theories brought up.
1. The reduction in atmospheric lead
2. The reduction of unwanted births
3. The peace dividend from the end of the cold war
4. Gun Control
5. Increase in Incarceration.
1. The reduction in atmospheric lead
2. The reduction of unwanted births
3. The peace dividend from the end of the cold war
4. Gun Control
5. Increase in Incarceration.
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I think the first 3 are plausible in this case, and it's probably a mix of all of those factors. The ones that are less likely are 4 and 5, because these factors are not correlated with the decrease in every country, there's countries and localities that have done exactly the opposite things during these two factors and yet had the same results in that decade and a half.