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I don't think it proves anything when you think about the amount of information available and the sources.
I expect the posters looked information up on the internet - where newspapers have been backfilling their old copy.
It's easy to nationally about incidenct after 1990, but to collect the same information aobut the 70s or 50s you need to go to the microfliche (spelling), which are only kept locally.
As for why it is happening.
Heavy Metal Music - no that was the late 80s
Dungeons and Dragons - no that was the early 90s
End of the Millenium - (ok I couldn't remember what was blamed all the time for the late 90s)
Rap Music - no that was early 2000s
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