With film it was always trickier, but with still images? I'm afraid you're proving my point.
I'm in my 40s, my experience with film is pre-digital, and the darkroom process for fakery is the exact same process for making a photographic print. It's trickier, it requires fast hands and patience, but it's entirely doable with a single hobbiest and some darkroom access. Faking negatives is harder, but not impossible.
And that, of course, is just if you're faking things after the fact. All the microscopes in the word won't tell you a negative has been tampered with if the UFO in question was a hubcap being thrown like a frizbee, or if the person in the photograph just happens to look like you at that distance in that lighting.
After 1995 or so, all it took was a desktop computer and a cracked copy of photoshop.
Everyone thinks they can spot photoshoppery and traditional fakery, but that's just confirmation bias because you don't know about the hundreds of altered images that flew past you every day, and because a lot of photomanips weren't done with trickery in mind. Yeah, most of the head swaps you found on the internet pre-faceswap apps are obvious, but most of them were made for jokes or for porn, and in neither case is believably a major priority. When someone wants it to look seamless and is willing to put in the time, it's not that hard.
The only unaltered photography most people have ever seen were polaroids or snapshots taken on film. Everything else has been adjusted and manipulated and cropped for purpose, even if just to make the contrast sharper and the colors more vivid. Before she was photoshopped, she was airbrushed. Even if she's not photoshopped, she's prepped and posed and pinched, with a team of people to make her look impossibly good in a way that seems perfectly natural.
Is it easier than ever before? Yes, but that's always been the trend.
And you've never had to be skilled to trick people, in fact, the best tricks are obvious ones that filter out the non-suckers.
The Cottington Fairies were, quite famously, faked by children with paper dolls.
The shittiest Weekly World News photobashes tricked tens of thousands.
Fake cryptid photos made with toy submarines and modelling putty or a shakey camera and an above-average gorilla suit are still fooling people today.
Photographs of dead celebrities that 'prove they faked their deaths' happen all the time, because there's only so many ways a human face tends to go together.
Just go looking at what the paranormal and UFO types show off as evidence.
What folks can do with blender and some filtering is mindblowing.
The similarity doesn't even have to be that close, look at Luigi V the Claims Adjuster, if the brows don't split, you must acquit.
If it takes AI to get people to start being skeptical of what they take in, that's a win for AI, because you should have always been that way. If you are worried now and weren't before, it's a difference of in awareness of the danger, rather than a difference in its presence.
I don't know where we went wrong on this. I was growing up in the 1980s and my elders hammered into me that "seeing is believing" was foolishness, and yet after the advent of modern special effects, easy digital photography, and hoax-after-hoax-after-hoax-after-god-fucking-damn-hoax, the idea that video and photography were believable on their own merits somehow wormed its way back in.
Evidence requires context to be evidence. You have to know where it came from, how it was acquired, who had access along the way, what other supporting or nonsupporting evidence there is, and you have to be able to know if a situation is plausible or implausible and err on the side of further research and consideration.
It takes work, but it is worth it.