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!