Practically I think there are situations where it is not so black and white. Like camera footage used as evidence in a court case. Signing a video with a publ

Practically I think there are situations where it is not so black and white. Like camera footage used as evidence in a court case. Signing a video with a public key would give some way to verify the source and chain of custody. Why wouldn't you in that situation? At a minimum it makes tapering harder and weakens false claims that something has been tampered with.