Not so much computers evil! as just acknowledging there will always be malicious actors who will find clever ways to use technology to cause harm. And yes, there's a gathering of folk on 4Chan/b who nudify (denudify?) submitted pictures, usually of people they know, which, thanks to the process, puts them out on the internet. So this is already a problem.
Think of Murphy's Law as it applies to product stress testing. Eventually, some customer is going to come in having broke the part you thought couldn't be broken. Also, our vast capitalist society is fueled by people figuring out exploits in the system that haven't been patched or criminalized (see the subprime mortgage crisis of 2008). So we have people actively looking to utilize technology in weird ways to monetize it. That folds neatly like paired gears into looking at how tech can cause harm.
As for people's faces, one of the problems of facial recognition as a security tool (say when used by law enforcement to track perps) is the high number of false positives. It turns out we look a whole lot like each other. Though your doppleganger may be in another state and ten inches taller / shorter. In fact, an old (legal!) way of getting explicit shots of celebrities from the late 20th century was to find a look-alike and get them to pose for a song.
As for famous people, fake nudes have been a thing for a while, courtesy of Photoshop or some other digital photo-editing set combined with vast libraries of people. Deepfakes have been around since the late 2010s. So even if generative AI wasn't there (which is still not great for video in motion) there are resources for fabricating content, either explicit or evidence of high crimes and misdemeanors.
This is why we are terrified of AI getting out of hand, not because our experts don't know what they're doing, but because the companies are very motivated to be the first to get it done, and that means making the kinds of mistakes that cause pipeline leakage on sacred Potawatomi tribal land.