I don't think it is that we police kids more these days.
I think it is a) the line in the sand that used to be generally accepted as to what is child appropriate has been scuffed and a lot of parents don't like it so we are policing kids less which creates more vocal outcries; and b) serious attempts to limit what adults are allowed to read have mostly faded away in our modern porn-friendly society.
When I was a kid no librarian would have imagined putting Clan of the Cave Bear in an elementary school library and the U.S. Postmaster General might seriously have considered prosecuting people for mailing Hustler. These days I wouldn't be surprised to see the former happen and would be shocked if the latter did.
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