I don't see this as being specific to AI. AI facilitates production as a tool, but the images are defamatory and contain hate speech no matter how they're generated.
I think the real answer here is to ignore it. Yes people are going to use AI to make videos about whatever they want. Whoever they want. Doing whatever they want them to be doing.
What will happen pretty quickly (and is already sorta happening) is people will assume all videos are fake. At that point celebrities could just start "leaking" their own videos and then claiming them to be faked. Eventually nobody will be able to tell anyways.
Gooners gonna goon.
I have already had to correct several family members that have fallen for AI videos, pictures and "news articles".