Give it another few years and "we have evidence of you doing this and that" can become everyone's nightmare.

That's not how the legal system works. You can't take a random photo to court as evidence of anything. Whether it is AI generated or not is irrelevant.

I don't think GP is referring to the legal system, or at least not exxclusively. Think about what can happen within your family, social circle, neighbourhood, workplace etc.

Also yes, but I'm not sure the legal system would ignore video evidence. What if for example someone plants doctored videos into a CCTV security system faking their presence at the same time but far away from a place where they've just committed a homicide?