I too dread a little all the mischief that's going to happen while the world learns about this. But people don't have to uncritically believe "the evidence of their own eyes", even though that has been very useful corrective to many mistakes, and will I guess be less so now. Evidence doesn't work that way: people always have to interpret everything in terms of their understanding of the world, and they can get better at that in response to changes like this.
I agree. I don't think this in particular will land us in "land of no trust." I think it, and innovations like it, move us clearly towards that land though.
The advent of widespread photo/video evidence was a big help for people trying to interpret was real and what wasn't. Then photography was knocked out of service by e.g. Photoshop (generally "easy photo manipulation"). Now video is getting knocked out of service as well. So, yes, it removes a useful tool in interpreting the world's evidence, and it's not clear what will replace that tool (if anything).
To be clear, the "no such thing as trust" was specifically a response to GP's assertion that people will "have to unlearn that seeing is believing." Okay, fine, but then what can you believe if you not even what you see? Again this specific tech doesn't get us all the way there, but it gets us closer.
I too dread a little all the mischief that's going to happen while the world learns about this. But people don't have to uncritically believe "the evidence of their own eyes", even though that has been very useful corrective to many mistakes, and will I guess be less so now. Evidence doesn't work that way: people always have to interpret everything in terms of their understanding of the world, and they can get better at that in response to changes like this.