This is a good point, I hadn't really thought about it but the credibility of photos has cratered in the past decade.

Deepfakes' destruction of the credibility of videos is still worse because it totally removes the ability of a random citizen witness to capture evidence. This has been useful in the past, e.g. for documenting police brutality or just-developing events like shootings.

In a way this is a very undemocratic development -- putting the power of deepfakes in the hands of ordinary people is going to make everybody a less credible witness, no?