While I do wholeheartedly agree that promoting fetishization of marginalized people who are vulnerable is despicable, evil, and just about any other pejorative you can think of--but it's a thought crime.
It's not illegal to create digital art (even the disgusting kind) which depicts fictitious grown adults doing grown adult things.
I would argue that if any such subclass of degenerate could exist, then they already do exist. You're not creating this subclass and any claim of expansion of such a subclass would be anecdotal at best and bullshit at worst. If they're out there they're out there. It's a chicken and egg problem. Which came first, the pornography or the degenerate?
We have a constitutionally protected right in this country to freedom of expression and that right cannot be infringed simply because you believe that it could lead to more people being taken advantage of. The right to that expression must be protected regardless of how repugnant you believe the resultant actions are. As history is shown any number of times the restriction of any right is a slippery slope in any capacity. There's a quote by Noam Chomsky which is particularly relevant here;
If you believe in freedom of speech, you believe in freedom of speech for views you don't like. Goebbels was in favor of freedom of speech for views he liked. So was Stalin. If you're in favor of freedom of speech, that means you're in favor of freedom of speech precisely for views you despise.
As a society we need to strongly condemn these actions, and we need to ensure that the most vulnerable among us are absolutely protected. But as soon as you start making thought crimes illegal you open the door to any number of machinations. How long before the extreme right use that precedent to start prosecuting individuals for other thought crimes? I would bet my last dollar it wouldn't take very long...
