If you don't see how even the most basic of AI images, videos, deepfakes, etc. can manipulate the public, the electorate, popular opinion, or even sow just enough doubt as a cause a problem, then I don't know what to tell you.
People are already dying because of deepfakes and fake AI porn. We know that most people who see some headline on Facebook will never click farther to read it, and will just accept the headline and/or the synopsis as fact. They will accept something a 1000x re-shared image says, without sources or verification. The fact that a picture or vid might have a person with 8 fingers on one hand in the background isn't going to prevent them from taking in the message. And we've all literally seen people around the web say , explicitly, something to the effect of "I don't care if the story is true or not, it's a real issue we need to consider" when we know for a fact that it is not.
Yes, mis- and dis-information are far more of an existential thread than chem or bio weapons, and we know this because we are already seeing the consequences of it. If you refuse to see that, then you are lost.