Anons have pointed out, and I believe Q has also mentioned, the alteration and "erasure" of historical facts that don't suit the NWO agenda.
I don't know how long this will be available, but here is a PDF of the DSM II giving categorization of psychiatric disorders from 1968. Not only is homosexuality considered a disorder, but vaccines are noted to be a cause of "mental retardation" via encephalopathy.
Sauce: https://www.madinamerica.com/wp-content/uploads/2015/08/DSM-II.pdf