I am guessing that some of them did, but I don’t think the authors of an eighth grade textbook used by voucher schools in Louisiana and Indiana included this little historical nugget in their treatment of hippies because they wanted to present a full and accurate picture of the 1960s counterculture.
The textbook, America: Land I Love is published by A Beka Books, a publishing house affiliated with Pensacola Christian College that I discussed briefly in chapter four of Was America Founded as a Christian Nation?: A Historical Introduction.
America Blog recently posted an image of the pertinent page of the textbook:
Apparently this Louisiana voucher program has gotten into trouble before by using textbooks that praise the Ku Klux Klan, teach that human beings and dinosaurs walked the earth together, and affirm the existence of fire-breathing dragons.
I am sure there is a larger critique of school voucher programs in all of this.