Not telling the truth differs from false

I wonder if the principle prevailing while Feudal period, "Don't tell the truth but let them follow to the Ruler.". Even now such a saying goes around the world? SARS CoV-2 is well known as a awful plague leading to the fatal in the worst. Fearful heart to some invisible object might be a good power to obey people that was endeavored on German people by the German Government expert meeting a few years ago leading to a big demonstration as a matter of fact. The deep-rooted heart that deceives people might remains even after the worst Holocaust however better the German leader now might pretend. But this kind of tendency is observed in every country even on us. In order to unite people, any slogan or an approaching fear are needed. Anyway, the time passing would solve this problem sooner or later, with all conflict and clashes of opinion and ideology or violence, the change of politics depending on the country might happen as a natural phenomena.