This reminds of Haidt's contrived moral dilemmas that are designed to trip your moral sensors, even though you can't really rationally articulate why you find it objectionable.

Realistically, I can't think of clear big or likely harms caused by this exploit. But I really really don't like this latent space existing in my AIs. It just makes me uncomfortable.

And over time I've learned to trust those moral intuitions more than I trust reason alone.

There’s the obvious harm that some people are just not equipped to see these graphic images, especially with no warning. Like people who have trauma from being in or around the acts being depicted