I'm sure there are multiple factors that contribute to this positive trend ranging from demographics to education. I also suspect we're incarcerating too many people for too long for relatively petty crimes, but I don't think anyone would want to see our prisons emptied. We have a lot really bad folks behind bars that need to stay behind bars, while the three strikes and you're out law never should have been passed in the first place.
There are some other views on why crime is falling at the link below.
http://www.economist.com/blogs/econo...st-explains-16
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