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For those who don't want to or can't watch the video: a PSA plays at 3am, stating that the USA has completely surrendered but is 'claiming victory even in defeat' and is asking the people watching to 'preserve the spirit of America, untarnished' by killing themselves and their family members. Towards the end of the video the PSA cuts off and the station dismisses it as a hoax.
Now lets say that, regardless of whether its a (very dark LBJ 2nd term) government accidentally playing something it never wanted to or a much more sinister in nature Max Headroom-style incident, such a PSA actually played at 3am in the late 60s US... what would happen?
The very late (or early, from a certain perspective) time at which its playing would certainly help limit its effects, but what damage would this manage to cause?