The last two claims always felt wrong to me, because they're assuming a society where these kinds of tools are easy to use and accessible to everyone, yet the society at large is completely oblivious to these tools and their capabilities. Arguably, you couldn't ever fully trust images before, people claimed something was photoshopped for decades now. Instead of something "looking realistic", trusting people and organizations will take its place - when, for example, the BBC posts a photograph, I'm inclined to trust it not because it looks real, but because it's the BBC.