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Well as I said, I think there's a collection of things we already use for judging what's true, this would just be one more tool.
A cryptographic signature (in the original sense, not just the Bitcoin sense) means that only someone who possesses a certain digital key is able to sign something. In the case of a digitally signed photo, it verifies "hey I, key holder, am signing this file". And if the file is edited, the signed document won't match the tampered version.
Is it possible someone could hack and steal such a key? Yes. We see this with certificates for websites, where some bad actor is able to impersonate a trusted website. (And of course when NFT holders get their apes stolen)
But if something like that happened it's a cause for investigation, and it leaves a trail which authorities could look into. Not perfect, but right now there's not even a starting point for "did this image come from somewhere real?"