The viewer needs to ask the question before they seek the answer. Lies depend as much on the viewer's desire to believe as it does on the lie itself.
There are already short videos that 95% of people would not question. And, I suspect everyone has already been fooled at least once by an image, no matter how skeptical.
They who would fool us don't need 100% of us to believe, there will always be "conspiracy nuts", which is how they can dismiss those who ask. It doesn't help at all that many people are knee-jerk calling anything suspicious to them "AI". Not always because of something in the image, just that in their limited experience "that never happens", so, "it must be AI".
If you're out in the world, and you claim something is AI, give your reasons. Point out what you saw, don't just do a drive-by comment, that makes it worse, not better.