1968.
Hippies became a mass-market
meme (kinda like
mallternative);
Haight-Ashbury and similar places infested with tourists, slummers, runaways.
Drugs became an industry, the quality dropped; some folks "preferred" non-utopian drugs.
Nixon elected;
Robert Kennedy and
Martin Luther King shot. The
FBI turned into the Gestapo. Tet.
Paris went nuts with the smell of
revolution (or bad
brie);
Chicago's police
rioted and busted heads. No
Sixties for you!