I suppose what we have here is a clash of freedoms. The person prone to psychosis has their freedom to not have their mental state fucked with challenged by the existence of the machine, the person who is not prone to that has their freedom to own a sex machine challenged by banning or limiting access to the machine. When put into those terms, it seems that the sex machine itself is a silly thing and should be banned - but I'm not so sure. The person with a peanut allergy is threatened by the mass agriculture of peanuts, but we inherently recognize that banning all peanuts would be unfair to the vast majority of people who do not possess such an allergy. Thus "AI psychosis" should be educated about and guarded against as should other psychologically addictive behavior.
That question is framed ridiculously. The "classic" opinion on hexbear is most certainly not that all media is apolitical, what the fuck are you talking about. The question is to what degree media should be censored - I would argue that censorship in a modern context is best authored from the algorithm, so such content should only ever be available to those who specifically seek it out, but not that it's creation or consumption should be criminalized. And to preempt the escalation that I know is coming next: obviously that logic doesn't hold if someone was harmed in the creation of the media itself, which is and should remain illegal, or if the class of media is such that its proliferation would make enforcing the previous rule impossible, which is a real and predictable harm to society by a certain class of generated content that AI psychosis does not represent.