There have been attempts to cryptographically sign images, which have largely been broken, but the principle is there: https://www.dpreview.com/opinion/9955873926/why-cryptographi...
If the plan is to have a few trusted manufacturers for CCTV and police cameras than that might work, but will do little to combat misinformation.
Eh, there are so many ways where a large photo can fail. I'm obsessed with AI Art, but I think there will be human(or AI) detectors that will be paid to determine validity.
I don't see how we can without great harm. The only adaptation that I can see is to stop trusting in anything at all, and we're already dangerously far down that road as it is.
Parent may not be expressing it right, but he does have a point. There is a level of 'interpretation' that is being done during the taking of a picture. If you add to this recent attempts to incorporate AI into picture taking to add/remove parts thereof all of a sudden parent's proposition does not sound so far fetched.
Granted, it is still a different level than just generating an image from a prompt, but I would not dismiss the thought outright.
You can think of a photo like a news article, the author can be completely truthful while omitting certain facts to give a false impression. The same can be done with how a photo is framed, cropped and processed.
The intent of a photographer can definitely be translated into the photograph or it wouldn't be an artform.