It is not just democracy. All governance systems are susceptible to mass communication tools that can change public opinion, be it books, radio, tv, news organizations, or tiktok. It is why many non democratic countries do not have freedom of press, and a highly censored internet. This is a main contributor to Arab Spring.
It is just sad that even US is susceptible to this.
Well mass manipulation of the people is how the USA functions. This is what Noam Chomsky and Edward Herman wrote about extensively in their book Manufacturing Consent from 1988. So it is no wonder it works when other people do it too. I agree though, it is sad, or frustrating, upsetting, infuriating, that the USA works like that.
It is just sad that even US is susceptible to this.