Propaganda nearly always collapses, eventually, but almost always it gets replaced by even more propaganda. Its a victory to have propaganda replaced by truth and honesty, whenever it happens. Something similar happens with revolutions. Typically you replace one bad government by another. Sometimes people learn though, and that is the real victory. For a time they then get good government. Then they forget, then the government integrity declines.
If the people are not vigilant, that is the citizens of whichever country is concerned, then things go backward. Health consumers also have to be vigilant.