It seems they kind of had some idea about this stuff especially after what you uncovered. There was a movie from 1983 called "WarGames" !?!?
Why oh why cyberspace was only recognised as 5th operational domain only in 2016? Why do we have all kinds of cyber regulations kicking in past 3-4 years (well GDPR was already 10 years ago).
I guess you don't have the answers (asking Cliff Stoll but whoever else feels like responding I will be happy as well) for that but I think it still a fun question to ask. I obviously don't want to call out anyone stupid but somehow I cannot believe it took all that time to grow and become what it is today with all the regulations and "important" people recognising the issue.
It wasn't that long ago where the network traffic of every website was transmitted in the clear via http, not https. Literally anyone at a coffee shop could listen to the WiFi network and see everything being sent and received in plain text. GMail didn't move to https until 2010, and I think it was one of the first webmail sites to do it. Browsers only started flagging non-https sites just in the past few years.
It already seems far fetched, honestly.