I can destroy the radio spectrum very easily, especially HF. Just transmit at a higher amplitude. Or better spoof the communicators and transmit false information. You will need code books, etc. That all takes time.
But my point is not to disparage HF operation, it certainly has its place. My point is that HF is not handy for mass communicating in the modern world, because so few people would be taking part.
CB radios would be handy, but few still have them, and of course, they are very limited in range.
The internet and cell phones allow people to communicate information to directly to hundreds/thousands/millions of individual people regardless of distance. That is very powerful to instantly organize. HF doesn’t do that.
For the purposes of
Or the VOA
You haven't ever traveled in the third world have you?
/johnny