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I don't think we should inherently. I've thought about the idea of digitally signed photos and it seems sound unless someone is quite clever with electronics. I'm guessing there's some embedded key on the camera that is hard but maybe not impossible to access. If people can hack Teslas for "full autopilot" or run Doom on an ATM machine I'm not confident that this kind of encryption will never be cracked. However, I would hope an expert witness would also examine the camera that supposedly took the picture. I would think it to be impossible for someone to acquire the key without a 3rd party detecting the intrusion.
They make Hardware Security Modules (HSMs) that are very difficult to crack, to the point that it is unbreakable at our current technology level. With a strong HSM, a high-bit per-device certificate signed by the company's private key gives you authenticity and validation until the root key or HSM are broken, which is probably good enough for today while we try to figure out something better IMO.
Today we have EXIFs and it's better to wipe them all of these for privacy reasons. Because every picture you take otherwise contains a lot of your data like geoloc, model, exposuer, etc. That's the angle they are yet to tackle - because most of these things are also leave us vulnerable.