|These stereotypes were wrong then and are wrong now.|
Why now? Because the government, the military, and the press have finally achieved zero credibility. They can "disclose" whatever they like, and people won't panic because they'll still feel deep down that it's all got to be BS. Boys who cry wolf may speak freely.
Not that people won't "believe" the disclosures, of course. Watch for a time when belief in UFOs and little green men is mandatory, and those who peddle laughable conspiracy theories about lenticular clouds and weather balloons will be tarred as "ET deniers" or whatever the term ends up being. ("Xenophobes" is already taken, I'm afraid.)
"Little green men" will be hatespeak, of course -- to say nothing of the depersonizing "Grays" -- and old books using such phrases will get Seussed.
Oh, and it'll be a splendid opportunity to purge the language of such problematically non-inclusive expressions as "human rights." Humans are set to become the new white people.
An interesting time to be alive!