While violence has always been around, and seems to be decreasing if anything, IMHO, there is a middle ground of inconsiderate, rude or arrogant behaviour that is increasing, and not just amongst teenagers.
I recall clearly as a kid the arguments of my elders regarding courtesy on public transport (or, indeed, anywhere) and giving up one's seat for an adult, any adult ... and most children did. Now that I'm an "elder", I hear that far less (as if people have given up that battle) and the concern is shifting to aggressive, hostile or other outright obnoxious behaviour.
I do think there is a problem, but my evidence is merely anecdotal.
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