You put the bad actors in prison, or if they're outside your jurisdiction, and they're harming your citizens, and you're America, you go murder them. This has to be the solution anyway because the technology is already widely available. You can't make everyone in the world delete the models.

Yes signing so the way you show something is authentic. Like when the Hunter Biden email thing happened I didn't understand (well, I did) why the news was pretending we have no way to check whether they're real or whether the laptop was tampered with. It was a gmail account; they're signed by Google. Check the signatures! If that's his email address (presumably easy enough to corroborate), done. Missed opportunity to educate the public about the fact that there's all sorts of infrastructure to prove you made/sent something on a computer.