What a radical concept, looking at actual aggregated data when trying to make up your mind on a subject.
Looking at those graphs, by the way, I'm sure you were struck by the sharp and very scary rise in youth violence from about 1985 to about 1992, followed by an equally sharp decline. Now, there is a connection between that and Grand Theft Auto. That's the crack epidemic... and GTA: San Andreas is *about* the crack epidemic! Need I say more?!?
Now, I wonder what would happen were you to look at similar data on, say, the assimilation rate of immigration waves, and relate that to the frothing about the Hispanic threat to the American way of life/the Muslim threat to the European way of life...?