It's not about banning works that don't include such things. It's about genuine concern that entire categories of works that lack them cause problems.
If none of my images from Stable Diffusion contain black people, that's not a big deal (I mostly don't even ask it for people, because it's not that good at them).
If none of the images from Stable Diffusion or any of its brethren contain black people, that's a problem, especially if we start using these sorts of tools to generate art for things like games, book illustrations/covers, etc....but even if we don't; even if it's just a bunch of people playing around with them on the Internet. Not seeing yourself in media, even this kind of media, does a kind of harm that it's very hard for us "normal" (white, cis, straight, male, etc—and yes, I am all of those) people to fully grasp.
If none of my images from Stable Diffusion contain black people, that's not a big deal (I mostly don't even ask it for people, because it's not that good at them).
If none of the images from Stable Diffusion or any of its brethren contain black people, that's a problem, especially if we start using these sorts of tools to generate art for things like games, book illustrations/covers, etc....but even if we don't; even if it's just a bunch of people playing around with them on the Internet. Not seeing yourself in media, even this kind of media, does a kind of harm that it's very hard for us "normal" (white, cis, straight, male, etc—and yes, I am all of those) people to fully grasp.