Fear stems from the unknown, and the current unknown is the "Sagali" civilization. Their successive invasions, especially with parasitic traits, inevitably cause panic, no matter how often the sovereignties seal off the news. In such a long period, there's no way to completely conceal the truth.
The eyes of the masses are sharp, and there is a skill called word of mouth, which the sovereignties cannot stop.
The first to hear the news are the societal upper echelons; those big figures always have various channels, including well-informed individuals. Then it reaches those around these big figures; even the slightest hint can easily piece together the general content, and thus the news spreads to those who should not hear it, and yet it does not stop there.
