It doesn't take AI to fool people. They have been propagandised and lied to on a major scale since mass media.
They also lie themselves: they cannot detect overt bias or reflect on themselves and be aware of their hidden motives, resentments and wishful thinking. Including me and you.
Most people hold important beliefs about the world that are comically inaccurate.
AI changes absolutely nothing how many true or false beliefs the average Joe holds.