"In the last few years, with very little fanfare, we've conclusively settled the questions of flying saucers, lake monsters, ghosts, and Bigfoot."
Am sure the usual justification to apply salve to your conscience for this sort of activity is the trope that the 'bad guys' will do it anyway, so we need to do it before them to counter them and be the torch-bearer of liberty.
The atom bomb was developed upon that fear and pretext. Compared to that AI is a fairly mild thing.
The US isn't perfect but to say it was the "bad guy" in the war isn't an argument supported by anyone's facts.
At best, crypto can give you a statement like "something possessing the particular secret X claims to have sensed this data at this point of time" combined with "there's a device with secret X that has it's software/firmware integrity verified and signed by entity Y". Crypto can't ensure that the secrets on the device aren't actually leaked by the manufacturer to enable "verifying" of arbitrary data outside of that device, and there's always the option to simply ensure that the sensor "sees" what you want; a camera and all the crypto on it can't tell whether it's pointed at a real event, at a staged event, or at a sophisticated optical device projecting arbitrary photoshopped data.
And due to AI and it's rapidly increasing misuse by enormous conglomerates, it will be very soon when videos are never trusted but rather treated as comedic rumor and folklore, and we will go back again to how it always was.
...until replicants come.
I'm saddened that there are actual "smart" people who waste their days to work on these malicious forms of AI, be it Google's almost entire arsenal, or anything. However, i'm not surprised they do, but it is still sad.